Pick any stylesheet from the left, and make your changes on the right, at the bottom.For this reason, it's more convenient to get a live preview by editing the site's stylesheet: That offers no advantage over using an external editor. You can use the above method to edit userContent.css, but changes won't be visible until the file is saved and a new window is opened.
Either press Ctrl+Alt+Shift+I or Cmd+Opt+Shift+I, or click the ≡ Menu button, then Web Developer, then Browser Toolbox.In the bottom right, check both Enable browser chrome and add-on debugging toolboxes and Enable remote debugging.In the developer tools pane, click the cog wheel button near the top right.Either press F12, or click the ≡ Menu button, then Web Developer, then Toggle Tools.See the Browser Toolbox article for details. If you're an advanced user familiar with CSS, you can use Firefox's developer tools to preview your changes. At the top of the respective file, either userChrome.css or userContent.css, add a rule like the url("separate_css_file.css").Save the style as a separate *.css file in the chrome folder.You could paste every script in a single file named userChrome.js in the chrome folder, but that's not very manageable.Ĭopy the code from the style, then paste it at the bottom of the respective file, either userChrome.css or userContent.css. Simply save the *.uc.js files into the chrome folder. A restart is required for the change to take effect, though the files won't affect anything until you add some styles or scripts.Īdding user scripts - obsolete in Firefox 72 Option 1.If you already have your own CSS files set up, only copy the code from the ZIP's userChrome.css into your own. If you extract it into your Firefox profile folder, it will create the chrome folder, and inside it, userContent.css and userChrome.css. This launches a file manager window with your Firefox profile folder. Enter about:support into Firefox's location bar.If it's not set to true, double-click it to change its value, then restart Firefox.
Enter about:config into Firefox's location bar, then search for the preference.** In order for userChrome.css to work, you need to open `about:config` and change Learn more about bidirectional Unicode url( html url( "") To review, open the file in an editor that reveals hidden Unicode characters. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below.
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