According to this ghacks post one must enable the following setting for the userChrome.css styles to take effect: These extensions are prefixed with -moz. * Add private browsing indicator per tab */Ĥ Update - userChrome.css Styles No Longer Enabled by DefaultĪpparently as of Firefox 69.0, the userChrome.css is no longer applied by default (thanks Mozilla). Mozilla CSS extensions Mozilla applications such as Firefox support a number of special Mozilla extensions to CSS, including properties, values, pseudo-elements and pseudo-classes, at-rules, and media queries. * Show title of unread tabs with red font */ mkdir chromeĬreate the userChrome.css File (If Not Present)Ĭreate a file called userChrome.css in the chrome directory, and add the following snippet: /* Hide tab bar in FF Quantum url("chrome://browser/content/browser.xul") Start Firefox in Safe Mode to check if one of the extensions ('3-bar' menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem. I did not have a chrome directory, so I created one according the the Mozilla documentation. ~/.mozilla/firefox/profile Create chrome Directory (If Not Present) ~/Library/Application Support/Firefox/Profiles/fault Linux
In order to add the CSS snippet, we need to find the Firefox profile folder, navigate to the chrome folder, and add the snippet to a file called userChrome.css Find the Firefox Profile DirectoryĬonsult these docs to find the Firefox profile directory on your operating system. The top tab bar is redundant when using the Tree Style Tabs extension. It is possible to hide Firefox's top tab bar by adding a snippet of CSS to the userChrome.css (docs: ) file in the Firefox profile directory. This comment in a Hacker News thread: explains some browser customizations that works well with the Tree Style Tabs Firefox extension in Firefox Quantum.
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