{"id":20412,"date":"2025-12-03T10:00:53","date_gmt":"2025-12-03T01:00:53","guid":{"rendered":"https:\/\/www.ecomottblog.com\/?p=20412"},"modified":"2025-12-03T09:04:26","modified_gmt":"2025-12-03T00:04:26","slug":"firefox%e3%82%92usercontent-css%e3%81%a8userchrome-css%e3%81%a7%e6%a5%b5%e9%99%90%e3%81%be%e3%81%a7%e3%82%ab%e3%82%b9%e3%82%bf%e3%83%9e%e3%82%a4%e3%82%ba%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.ecomottblog.com\/?p=20412","title":{"rendered":"Firefox\u3092userContent.css\u3068userChrome.css\u3067\u6975\u9650\u307e\u3067\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\uff01"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01<br \/>\n\u30af\u30e9\u30a6\u30c9\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u90e8\u306e\u77f3\u5d0e\u3067\u3059\u3002<\/p>\n<p><a href=\"https:\/\/www.ecomottblog.com\/?p=18640\">\u524d\u56de<\/a>\u306b\u5f15\u304d\u7d9a\u304d\u3001Firefox\u306e\u826f\u3044\u3068\u3053\u308d\u3092\u304a\u4f1d\u3048\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<br \/>\n\u4eca\u56de\u306fFirefox\u306e\u7279\u5fb4\u306e\u4e00\u3064\u3067\u3042\u308b\u9ad8\u3044\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u6027\u304c\u3001\u5b9f\u969b\u306b\u3069\u306e\u304f\u3089\u3044\u3059\u3054\u3044\u306e\u304b\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<br \/>\n<!--more--><\/p>\n<h2>\u30e6\u30fc\u30b6\u30fc\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u306e\u6709\u52b9\u5316<\/h2>\n<p>Firefox\u306f\u57fa\u672c\u8a2d\u5b9a\u3060\u3051\u3067\u3082\u30dc\u30bf\u30f3\u3092\u4efb\u610f\u306e\u4f4d\u7f6e\u306b\u914d\u7f6e\u3067\u304d\u308b\u306a\u3069\u9ad8\u3044\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u6027\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u305d\u308c\u3060\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<br \/>\n\u5b9f\u306fFirefox\u306f\u30d6\u30e9\u30a6\u30b6\u306e\u5916\u89b3\u81ea\u4f53\u304cHTML\uff08\u306b\u4f3c\u305fXML\uff09\u3068CSS\u3067\u69cb\u7bc9\u3055\u308c\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u624b\u9806\u3067CSS\u3092\u8a18\u8ff0\u3059\u308c\u3070\u3055\u3089\u306b\u81ea\u7531\u5ea6\u306e\u9ad8\u3044\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h4>Firefox\u8a2d\u5b9a\u5909\u66f4<\/h4>\n<p>\u521d\u671f\u8a2d\u5b9a\u3067\u306f\u30e6\u30fc\u30b6\u30fc\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u304c\u7121\u52b9\u5316\u3055\u308c\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u3053\u308c\u3092\u6709\u52b9\u5316\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u30a2\u30c9\u30ec\u30b9\u30d0\u30fc\u306b about:config \u3068\u5165\u529b\u3057\u3066\u300c\u9ad8\u5ea6\u306a\u8a2d\u5b9a\u300d\u753b\u9762\u3092\u958b\u304d\u307e\u3059\u3002<\/li>\n<li>\u691c\u7d22\u6b04\u306b\u300ctoolkit.legacyUserProfileCustomizations.stylesheets\u300d\u3068\u5165\u529b\u3057\u307e\u3059\u3002<\/li>\n<li>\u4e0a\u8a18\u306e\u8a2d\u5b9a\u304cfalse\u306b\u306a\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u30c0\u30d6\u30eb\u30af\u30ea\u30c3\u30af\u3057\u3066true\u306b\u5909\u3048\u307e\u3059\u3002<\/li>\n<li>\u300c\u9ad8\u5ea6\u306a\u8a2d\u5b9a\u300d\u753b\u9762\u3092\u9589\u3058\u307e\u3059\u3002<\/li>\n<\/ol>\n<h4>CSS\u30d5\u30a1\u30a4\u30eb\u914d\u7f6e<\/h4>\n<ol>\n<li>\u30a2\u30c9\u30ec\u30b9\u30d0\u30fc\u306b about:profiles \u3068\u5165\u529b\u3057\u3066\u300c\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u306b\u3064\u3044\u3066\u300d\u753b\u9762\u3092\u958b\u304d\u307e\u3059\u3002<\/li>\n<li>\u30eb\u30fc\u30c8\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u30fc\u306e\u300c\u30d5\u30a9\u30eb\u30c0\u30fc\u3092\u958b\u304f\u300d\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3057\u307e\u3059\u3002\uff08\u8907\u6570\u306e\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u306f\u300c\u65e2\u5b9a\u306e\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u300d\u304c\u300c\u306f\u3044\u300d\u3068\u306a\u3063\u3066\u3044\u308b\u307b\u3046\u3067\u3059\uff09<\/li>\n<li>\u30d5\u30a9\u30eb\u30c0\u30fc\u304c\u958b\u3044\u305f\u3089\u3001\u300cchrome\u300d\u3068\u3044\u3046\u540d\u524d\u306e\u30d5\u30a9\u30eb\u30c0\u30fc\u3092\u65b0\u898f\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<li>\u300cchrome\u300d\u30d5\u30a9\u30eb\u30c0\u30fc\u306e\u4e2d\u306b\u300cuserContent.css\u300d\u3068\u300cuserChrome.css\u300d\u3068\u3044\u30462\u3064\u306e\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u65b0\u898f\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u305d\u308c\u305e\u308c\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u5f79\u5272\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u300cuserContent.css\u300d\u3067\u306fWeb\u30da\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u308b\u9818\u57df\u306eCSS\u3092\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<a href=\"https:\/\/addons.mozilla.org\/ja\/firefox\/addon\/styl-us\/\" target=\"_blank\" rel=\"noopener\">Stylus\u62e1\u5f35\u6a5f\u80fd<\/a>\u3067\u3082\u540c\u3058\u3088\u3046\u306a\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001userContent.css\u3067\u306f about:home \u306a\u3069\u3001\u30d6\u30e9\u30a6\u30b6\u306b\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u3066Stylus\u3067\u306f\u5909\u66f4\u3067\u304d\u306a\u3044\u753b\u9762\u3082\u5909\u66f4\u53ef\u80fd\u3067\u3059\u3002<\/li>\n<\/ul>\n<ul>\n<li>\u300cuserChrome.css\u300d\u3067\u306fWeb\u30da\u30fc\u30b8\u8868\u793a\u9818\u57df\u306e\u5916\u5074\u306e\u9818\u57df\uff08\u30bf\u30d6\u30d0\u30fc\u3001\u30a2\u30c9\u30ec\u30b9\u30d0\u30fc\u3001\u30b5\u30a4\u30c9\u30d0\u30fc\u306a\u3069\uff09\u306eCSS\u3092\u5909\u66f4\u3067\u304d\u307e\u3059\u3002\u300cChrome\u300d\u3068\u306fGoogle Chrome\u306e\u3053\u3068\u3067\u306f\u306a\u304f\u3001\u30a2\u30d7\u30ea\u306b\u304a\u3044\u3066\u30e1\u30a4\u30f3\u8868\u793a\u9818\u57df\u306e\u5916\u5074\u306eUI\u90e8\u5206\u3092\u6307\u3059\u7528\u8a9e\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u30892\u3064\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u4efb\u610f\u306eCSS\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001Firefox\u672c\u4f53\u306e\u30c7\u30b6\u30a4\u30f3\u3084\u6319\u52d5\u3092\u5909\u5316\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u306a\u304a\u3001CSS\u3092\u5909\u66f4\u3057\u305f\u5f8c\u306fFirefox\u3092\u518d\u8d77\u52d5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30b5\u30f3\u30d7\u30ebCSS<\/h2>\n<p>\u4ee5\u4e0b\u3067\u306f\u3001\u30b5\u30f3\u30d7\u30eb\u3068\u3057\u3066\u79c1\u304c\u5b9f\u969b\u306b\u9069\u7528\u3057\u3066\u3044\u308bCSS\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<br \/>\n\u73fe\u6642\u70b9\u306e\u79c1\u306eFirefox\u30d0\u30fc\u30b8\u30e7\u30f3\u306f145\u3067\u3059\u304c\u3001\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u5909\u308f\u308b\u3068\u4e0d\u5177\u5408\u304c\u8d77\u304d\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u969b\u306f\u8a72\u5f53\u7b87\u6240\u3092\u4fee\u6b63\u3059\u308b\u304b\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>userContent.css<\/h3>\n<pre class=\"lang:css decode:true\">\/* \u2460\u300c\u65b0\u3057\u3044\u30bf\u30d6\u300d\u753b\u9762\u306eFirefox\u30ed\u30b4\u3068\u300c\u6700\u8fd1\u306e\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u300d\u30e9\u30d9\u30eb\u3092\u6d88\u3059 *\/\n@-moz-document url(\"about:home\"), url(\"about:newtab\") {\n    .logo-and-wordmark-wrapper, .section-top-bar {\n        display: none !important;\n    }\n}\n\n\/* \u2461\u30bd\u30fc\u30b9\u8868\u793a\u753b\u9762\u306e\u914d\u8272\u3092\u5909\u66f4 *\/\n@-moz-document url-prefix(\"view-source:\") {\n    #viewsource {\n        font-size: 90%;\n    }\n    #viewsource &gt; span:has(.error) {\n        background-color: #f007;\n    }\n    .start-tag, .end-tag {\n        color: lightgreen !important;\n    }\n    .comment {\n        color: #777 !important;\n    }\n    .entity {\n        color: #ffa !important;\n    }\n    .attribute-name {\n        color: deepskyblue !important;\n    }\n    .error {\n        font-weight: normal !important;\n        background-color: initial !important;\n    }\n}\n<\/pre>\n<h4>\u2460\u300c\u65b0\u3057\u3044\u30bf\u30d6\u300d\u753b\u9762\u306eFirefox\u30ed\u30b4\u3068\u300c\u6700\u8fd1\u306e\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u300d\u30e9\u30d9\u30eb\u3092\u6d88\u3059<\/h4>\n<p>\u300c\u65b0\u3057\u3044\u30bf\u30d6\u300d\u753b\u9762\u306eFirefox\u30ed\u30b4\u3068\u300c\u6700\u8fd1\u306e\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u300d\u30e9\u30d9\u30eb\u306f\u30b9\u30da\u30fc\u30b9\u306e\u7121\u99c4\u306b\u611f\u3058\u305f\u306e\u3067\u975e\u8868\u793a\u306b\u3057\u307e\u3057\u305f\u3002\u305d\u308c\u306b\u3088\u3063\u3066\u79c1\u306e\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\uff08\u7e261080px\uff09\u3067\u306f\u30b7\u30e7\u30fc\u30c8\u30ab\u30c3\u30c8\u30a2\u30a4\u30b3\u30f32\u884c\u3001\u6700\u8fd1\u306e\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a33\u884c\u3092\u30b9\u30af\u30ed\u30fc\u30eb\u305b\u305a\u306b\u8868\u793a\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-20732\" src=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_1.png\" alt=\"\" width=\"1198\" height=\"535\" srcset=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_1.png 1198w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_1-300x134.png 300w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_1-1024x457.png 1024w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_1-768x343.png 768w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_1-304x136.png 304w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_1-282x126.png 282w\" sizes=\"(max-width: 1198px) 100vw, 1198px\" \/><\/p>\n<h4>\u2461\u30bd\u30fc\u30b9\u8868\u793a\u753b\u9762\u306e\u914d\u8272\u3092\u5909\u66f4<\/h4>\n<p>Firefox\u306e\u30bd\u30fc\u30b9\u8868\u793a\u753b\u9762\u306b\u306f\u69cb\u6587\u30df\u30b9\u3092\u5f37\u8abf\u8868\u793a\u3057\u3066\u304f\u308c\u308b\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3042\u307e\u308a\u76ee\u7acb\u305f\u306a\u3044\u305f\u3081\u884c\u5168\u4f53\u3092\u5f37\u8abf\u8868\u793a\u3055\u305b\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002\u6587\u5b57\u8272\u306f\u9752\u7cfb\u306b\u3057\u3066\u3088\u308a\u5f37\u8abf\u8868\u793a\u304c\u76ee\u7acb\u3064\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3082\u5c0f\u3055\u304f\u8abf\u6574\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-20735\" src=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_2.png\" alt=\"\" width=\"689\" height=\"218\" srcset=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_2.png 689w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_2-300x95.png 300w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_2-304x96.png 304w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_2-282x89.png 282w\" sizes=\"(max-width: 689px) 100vw, 689px\" \/><\/p>\n<h3>userChrome.css<\/h3>\n<pre class=\"lang:css decode:true\">\/* \u30bf\u30d6\u30d0\u30fc *\/\n#TabsToolbar {\n    \/* \u2462\u30bf\u30d6\u30d0\u30fc\u306e\u5de6\u7aef\u306b\u62e1\u5f35\u6a5f\u80fd\u306e\u30dc\u30bf\u30f3\u3092\u914d\u7f6e\u3057\u305f\u5834\u5408\u306b\u5de6\u4e0a\u3092\u30af\u30ea\u30c3\u30af\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b *\/\n    #TabsToolbar-customization-target toolbaritem:first-of-type[id*=\"browser-action\"] {\n        margin-inline: 0 !important;\n\n        toolbarbutton.webextension-browser-action {\n            padding-block: 4px !important;\n        }\n    }\n\n    \/* \u2463\u30b3\u30f3\u30c6\u30ca\u30fc\u30bf\u30d6\u306e\u7dda\u3092\u6d88\u3057\u3066\u6587\u5b57\u8272\u3092\u5909\u3048\u308b *\/\n    .tabbrowser-tab[usercontextid] &gt; .tab-stack {\n        &amp; &gt; .tab-background &gt; .tab-context-line {\n            height: 0 !important;\n        }\n        &amp; &gt; .tab-content &gt; .tab-label-container &gt; .tab-label {\n            color: var(--identity-icon-color);\n        }\n    }\n}\n\n\/* \u30a2\u30c9\u30ec\u30b9\u30d0\u30fc(\u30c4\u30fc\u30eb\u30d0\u30fc) *\/\n#nav-bar {\n    #page-action-buttons {\n        \/* \u2464\u300c\u30bf\u30d6\u3092\u30bf\u30b9\u30af\u30d0\u30fc\u306b\u8ffd\u52a0\u3057\u307e\u3059\u300d\u3001\u300c\u5e38\u306b\u30b3\u30f3\u30c6\u30ca\u30fc\u3067\u30b5\u30a4\u30c8\u3092\u958b\u304f\u300d\u3001\u300cOpen Side View\u300d\u30dc\u30bf\u30f3\u3092\u975e\u8868\u793a\u306b\u3059\u308b *\/\n        &amp; &gt; #taskbar-tabs-button,\n        &amp; &gt; #pageAction-urlbar-_testpilot-containers,\n        &amp; &gt; #pageAction-urlbar-side-view_mozilla_org {\n            display: none !important;\n        }\n\n        \/* \u2465\u7ffb\u8a33\u30dc\u30bf\u30f3\u3092\u5e38\u306b\u8868\u793a\u3059\u308b *\/\n        &amp; &gt; #translations-button {\n            display: flex;\n            \/* \u5f37\u5236\u7684\u306b\u8868\u793a\u3057\u305f\u6642\u306f\u8584\u304f\u3057\u3066\u72b6\u614b\u5909\u5316\u3082\u7121\u52b9\u5316 *\/\n            &amp;[hidden] {\n                opacity: 0.5;\n                &amp; &gt; #translations-button-icon {\n                    fill: currentColor !important;\n                }\n                &amp; &gt; #translations-button-circle-arrows,\n                &amp; &gt; #translations-button-locale {\n                    display: none;\n                }\n            }\n        }\n    }\n}\n\n\/* \u2466\u30b5\u30a4\u30c9\u30d0\u30fc\u306e\u30b5\u30a4\u30ba\u30920%\u304b\u308990%\u307e\u3067\u8a31\u5bb9 *\/\n#sidebar-box {\n    min-width: auto !important;\n    max-width: 90vw !important;\n}\n\n\/* \u2467\u30da\u30fc\u30b8\u5185\u691c\u7d22\u306e\u5165\u529b\u6b04\u3092\u62e1\u5927 *\/\n.findbar-textbox {\n    width: 60em !important;\n}\n\n\/* \u2468\u30e1\u30cb\u30e5\u30fc\u306e\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u30fb\u30d5\u30a7\u30fc\u30c9\u30a2\u30a6\u30c8\u52b9\u679c\u3092\u7121\u52b9\u5316 *\/\npanel,\nmenupopup {\n    transition: none !important;\n}\n<\/pre>\n<h4>\u2462\u30bf\u30d6\u30d0\u30fc\u306e\u5de6\u7aef\u306b\u62e1\u5f35\u6a5f\u80fd\u306e\u30dc\u30bf\u30f3\u3092\u914d\u7f6e\u3057\u305f\u5834\u5408\u306b\u5de6\u4e0a\u3092\u30af\u30ea\u30c3\u30af\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b<\/h4>\n<p>\u30bf\u30d6\u30d0\u30fc\u306e\u5de6\u7aef\u306b\u62e1\u5f35\u6a5f\u80fd\u306e\u30dc\u30bf\u30f3\u3092\u914d\u7f6e\u3057\u305f\u5834\u5408\u3001\u30a6\u30a3\u30f3\u30c9\u30a6\u6700\u5927\u5316\u6642\u306b\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\u306e\u5de6\u4e0a\u9685\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u3082\u53cd\u5fdc\u3057\u306a\u3044\u30d0\u30b0\u3092\u4fee\u6b63\u3057\u307e\u3057\u305f\u3002\uff083\u5e74\u304f\u3089\u3044\u524d\u307e\u3067\u306f\u53cd\u5fdc\u3057\u305f\u306e\u3067\u30d0\u30b0\u3068\u8a00\u308f\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3059\uff09<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-20737\" src=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_3.png\" alt=\"\" width=\"568\" height=\"86\" srcset=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_3.png 568w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_3-300x45.png 300w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_3-304x46.png 304w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_3-282x43.png 282w\" sizes=\"(max-width: 568px) 100vw, 568px\" \/><\/p>\n<h4>\u2463\u30b3\u30f3\u30c6\u30ca\u30fc\u30bf\u30d6\u306e\u4e0a\u306e\u7dda\u3092\u6d88\u3057\u3066\u6587\u5b57\u8272\u3092\u5909\u3048\u308b<\/h4>\n<p>\u30b3\u30f3\u30c6\u30ca\u30fc\u30bf\u30d6\u306e\u30c7\u30b6\u30a4\u30f3\u304c\u76ee\u7acb\u3061\u3059\u304e\u3066\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u30bf\u30d6\u3068\u898b\u9593\u9055\u3048\u3084\u3059\u3044\u305f\u3081\u3001\u30bf\u30d6\u306e\u4e0a\u306b\u7dda\u3092\u5f15\u304f\u306e\u3067\u306f\u306a\u304f\u6587\u5b57\u8272\u3092\u5909\u3048\u308b\u30b9\u30bf\u30a4\u30eb\u306b\u5909\u66f4\u3057\u307e\u3057\u305f\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-20739\" src=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_4.png\" alt=\"\" width=\"773\" height=\"85\" srcset=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_4.png 773w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_4-300x33.png 300w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_4-768x84.png 768w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_4-304x33.png 304w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_4-282x31.png 282w\" sizes=\"(max-width: 773px) 100vw, 773px\" \/><\/p>\n<h4>\u2464\u300c\u30bf\u30d6\u3092\u30bf\u30b9\u30af\u30d0\u30fc\u306b\u8ffd\u52a0\u3057\u307e\u3059\u300d\u3001\u300c\u5e38\u306b\u30b3\u30f3\u30c6\u30ca\u30fc\u3067\u30b5\u30a4\u30c8\u3092\u958b\u304f\u300d\u3001\u300cOpen Side View\u300d\u30dc\u30bf\u30f3\u3092\u975e\u8868\u793a\u306b\u3059\u308b<\/h4>\n<p>\u30a2\u30c9\u30ec\u30b9\u30d0\u30fc\u5185\u306e\u53f3\u7aef\u306b\u8868\u793a\u3055\u308c\u308bPWA\u5316\u30dc\u30bf\u30f3\u3084\u3001\u79c1\u304c\u5165\u308c\u3066\u3044\u308b\u62e1\u5f35\u6a5f\u80fd\u306e\u30dc\u30bf\u30f3\uff08<a href=\"https:\/\/addons.mozilla.org\/ja\/firefox\/addon\/multi-account-containers\/\" target=\"_blank\" rel=\"noopener\">Multi-Account Containers<\/a>\u3068<a href=\"https:\/\/addons.mozilla.org\/ja\/firefox\/addon\/side-view\/\" target=\"_blank\" rel=\"noopener\">Side View<\/a>\uff09\u306f\u4e0d\u8981\u306a\u305f\u3081\u975e\u8868\u793a\u306b\u3057\u307e\u3057\u305f\u3002<br \/>\n\u203b\u79c1\u306fPWA\u3067\u958b\u304d\u305f\u3044\u30b5\u30a4\u30c8\u3082\u3042\u308b\u305f\u3081CSS\u3067\u6d88\u3057\u307e\u3057\u305f\u304c\u3001PWA\u6a5f\u80fd\u3092\u4e00\u5207\u4f7f\u308f\u306a\u3044\u306e\u3067\u3042\u308c\u3070 about:config \u3067\u300cbrowser.taskbarTabs.enabled\u300d\u3092false\u306b\u3059\u308b\u3053\u3068\u3067\u3082\u30dc\u30bf\u30f3\u3092\u6d88\u305b\u307e\u3059\u3002<\/p>\n<h4>\u2465\u7ffb\u8a33\u30dc\u30bf\u30f3\u3092\u5e38\u306b\u8868\u793a\u3059\u308b<\/h4>\n<p>\u4eca\u5e74\u3088\u3046\u3084\u304fFirefox\u306b\u65e5\u672c\u8a9e\u7ffb\u8a33\u6a5f\u80fd\u304c\u5b9f\u88c5\u3055\u308c\u307e\u3057\u305f\u304c\u3001\u5168\u4f53\u304c\u65e5\u672c\u8a9e\u3067\u4e00\u90e8\u304c\u82f1\u8a9e\u306a\u3069\u306e\u30da\u30fc\u30b8\u3067\u306f\u7ffb\u8a33\u30dc\u30bf\u30f3\u304c\u8868\u793a\u3055\u308c\u306a\u3044\u305f\u3081\u3001\u5e38\u306b\u8868\u793a\u3055\u305b\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002\u5f37\u5236\u7684\u306b\u8868\u793a\u3057\u305f\u5834\u5408\u306f\u7ffb\u8a33\u5143\u3068\u7ffb\u8a33\u5148\u306e\u8a00\u8a9e\u9078\u629e\u304c\u9006\u306b\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u5f37\u5236\u7684\u306b\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308b\u3088\u3046\u306b\u8584\u304f\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-20741\" src=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_6.png\" alt=\"\" width=\"1090\" height=\"446\" srcset=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_6.png 1090w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_6-300x123.png 300w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_6-1024x419.png 1024w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_6-768x314.png 768w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_6-304x124.png 304w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_6-282x115.png 282w\" sizes=\"(max-width: 1090px) 100vw, 1090px\" \/><\/p>\n<h4>\u2466\u30b5\u30a4\u30c9\u30d0\u30fc\u306e\u30b5\u30a4\u30ba\u30920%\u304b\u308990%\u307e\u3067\u8a31\u5bb9<\/h4>\n<p>\u30b5\u30a4\u30c9\u30d0\u30fc\u306e\u30b5\u30a4\u30ba\u306f\u901a\u5e380\u306b\u3067\u304d\u305a\u3001\u6700\u5927\u30b5\u30a4\u30ba\u308275%\u307e\u3067\u306b\u5236\u9650\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u3053\u308c\u30920%\u304b\u308990%\u307e\u3067\u5909\u3048\u3089\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n<h4>\u2467\u30da\u30fc\u30b8\u5185\u691c\u7d22\u306e\u5165\u529b\u6b04\u3092\u62e1\u5927<\/h4>\n<p>\u30da\u30fc\u30b8\u5185\u691c\u7d22\u306e\u5165\u529b\u6b04\u306e\u5e45\u309218em\u304b\u308960em\u306b\u62e1\u5927\u3057\u307e\u3057\u305f\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-20743\" src=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_8.png\" alt=\"\" width=\"1091\" height=\"41\" srcset=\"https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_8.png 1091w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_8-300x11.png 300w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_8-1024x38.png 1024w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_8-768x29.png 768w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_8-304x11.png 304w, https:\/\/www.ecomottblog.com\/wp-content\/uploads\/2025\/11\/firefox_css_8-282x11.png 282w\" sizes=\"(max-width: 1091px) 100vw, 1091px\" \/><br \/>\n\u203b\u4e0b\u8a18\u306eCSS\u3092\u9069\u7528\u3059\u308c\u3070\u30a6\u30a3\u30f3\u30c9\u30a6\u30b5\u30a4\u30ba\u306b\u5408\u308f\u305b\u3066\u62e1\u5927\u3055\u305b\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u304c\u3001\u53f3\u5074\u306b\u8868\u793a\u3055\u308c\u308b\u30d2\u30c3\u30c8\u4ef6\u6570\u306a\u3069\u306e\u6587\u5b57\u306b\u3088\u3063\u3066\u30b5\u30a4\u30ba\u304c\u5909\u308f\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3001\u56fa\u5b9a\u5e45\u306b\u3059\u308b\u307b\u3046\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n<pre class=\"lang:css decode:true\">.findbar-container &gt; hbox {\n    width: 100%;\n    .findbar-textbox {\n        width: 100% !important;\n        min-width: 18em !important;\n    }\n}<\/pre>\n<h4>\u2468\u30e1\u30cb\u30e5\u30fc\u306e\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u30fb\u30d5\u30a7\u30fc\u30c9\u30a2\u30a6\u30c8\u52b9\u679c\u3092\u7121\u52b9\u5316<\/h4>\n<p>\u30e1\u30a4\u30f3\u30e1\u30cb\u30e5\u30fc\u3084\u53f3\u30af\u30ea\u30c3\u30af\u30e1\u30cb\u30e5\u30fc\u304c\u3086\u3063\u304f\u308a\u8868\u793a\u3055\u308c\u3001\u3086\u3063\u304f\u308a\u6d88\u3048\u3066\u3044\u304f\u52b9\u679c\u3092\u7121\u52b9\u5316\u3057\u307e\u3057\u305f\u3002<\/p>\n<h2>\u8981\u7d20\u306e\u8abf\u67fb\u65b9\u6cd5<\/h2>\n<p>\u72ec\u81ea\u306eCSS\u3092\u8a18\u8ff0\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u5909\u66f4\u3057\u305f\u3044\u7b87\u6240\u306eHTML\u8981\u7d20\uff08\u30bf\u30b0\u540d\u3084ID\u3001\u30af\u30e9\u30b9\u540d\uff09\u3092\u77e5\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\nuserContent.css\u306e\u9069\u7528\u5bfe\u8c61\u306f\u901a\u5e38\u306eWeb\u753b\u9762\u3068\u540c\u69d8\u306bF12\u30ad\u30fc\u3092\u62bc\u3057\u3066\u958b\u767a\u30c4\u30fc\u30eb\u3067\u8abf\u67fb\u3067\u304d\u307e\u3059\u304c\u3001userChrome.css\u306e\u9069\u7528\u5bfe\u8c61\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u306e\u624b\u9806\u3067\u8abf\u67fb\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>F12\u30ad\u30fc\u3092\u62bc\u3057\u3066\u958b\u767a\u30c4\u30fc\u30eb\u3092\u958b\u304d\u307e\u3059\u3002<\/li>\n<li>F1\u30ad\u30fc\u3092\u62bc\u3057\u3066\u8a2d\u5b9a\u3092\u958b\u304d\u307e\u3059\u3002<\/li>\n<li>\u300c\u30d6\u30e9\u30a6\u30b6\u30fc\u3068\u30a2\u30c9\u30aa\u30f3\u306e\u30c7\u30d0\u30c3\u30ac\u30fc\u3092\u6709\u52b9\u5316\u300d\u3068\u300c\u30ea\u30e2\u30fc\u30c8\u30c7\u30d0\u30c3\u30ac\u30fc\u3092\u6709\u52b9\u5316\u300d\u306b\u30c1\u30a7\u30c3\u30af\u3092\u5165\u308c\u307e\u3059\u3002<\/li>\n<li>\u30e1\u30a4\u30f3\u30e1\u30cb\u30e5\u30fc\u306e\u300c\u305d\u306e\u4ed6\u306e\u30c4\u30fc\u30eb\u300d\u306e\u4e2d\u306b\u300c\u30d6\u30e9\u30a6\u30b6\u30fc\u30c4\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u300d\u3068\u3044\u3046\u9805\u76ee\u304c\u8ffd\u52a0\u3055\u308c\u308b\u306e\u3067\u30af\u30ea\u30c3\u30af\u3057\u307e\u3059\u3002<\/li>\n<li>\u300c\u30ea\u30e2\u30fc\u30c8\u30c7\u30d0\u30c3\u30b0\u63a5\u7d9a\u8981\u6c42\u300d\u3068\u3044\u3046\u30c0\u30a4\u30a2\u30ed\u30b0\u304c\u51fa\u308b\u306e\u3067OK\u3092\u9078\u629e\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u3053\u308c\u3067Firefox\u306e\u5916\u89b3\u90e8\u5206\u3092\u8abf\u67fb\u3067\u304d\u308b\u958b\u767a\u30c4\u30fc\u30eb\uff08\u30d6\u30e9\u30a6\u30b6\u30fc\u30c4\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\uff09\u304c\u8d77\u52d5\u3057\u307e\u3059\u3002<br \/>\n\u30e1\u30cb\u30e5\u30fc\u306a\u3069\u3001\u30d5\u30a9\u30fc\u30ab\u30b9\u3092\u5916\u3059\u3068\u6d88\u3048\u3066\u3057\u307e\u3046\u8981\u7d20\u3092\u8abf\u67fb\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u30fc\u30c4\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u5185\u306e\u30e1\u30cb\u30e5\u30fc\u306b\u3042\u308b\u300c\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u3092\u81ea\u52d5\u3067\u96a0\u3055\u306a\u3044\u300d\u306b\u30c1\u30a7\u30c3\u30af\u3092\u5165\u308c\u308c\u3070\u8abf\u67fb\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/firefox-source-docs.mozilla.org\/devtools-user\/browser_toolbox\/index.html\" target=\"_blank\" 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