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How to install a theme for Firefox

How to install a theme for Firefox
We will tell you how to install your own theme for the Firefox browser using the userChrome.css and userContent.css files.

Starting with Firefox 69 version, theme loading is disabled by default. You can enable it again in the browser settings (you only need to do this once), follow the instructions below.

Enabling the loading of themes in Firefox


  1. Open a new tab and type "аbout:config"in the address bar. If you open the page for the first time, a notification with a warning will appear. Click "Accept the risk and continue".
  2. In the "Search for parameter by name" line, enter "toolkit.legacyUserProfileCustomizations.stylesheets".
  3. Click on the button with two arrows located on the right. This will change the parameter from "false" to " true "(enable it).

Now that theme support is enabled, you can proceed to installing your skin. 

How to install a theme for Firefox

Installing the theme in Firefox


  1. Go to your profile folder. If you do not know its address, enter "аbout:support" in the browser's address bar and click on the "Open directory" button next to the "Profile directory" line in the table.
  2. Create a "chrome" folder if it is not in the directory.
  3. Move the file(s) userChrome.css and userContent.css to this folder.
  4. Restart the program.
  5. It's done! Now your browser has completely changed its appearance!

How to install a theme for FirefoxHow to install a theme for Firefox

How to remove a theme from Firefox


To delete a topic, perform all the steps in reverse order. You can clear the contents of the "chrome" folder, or completely delete it from your computer. After restarting, the standard layout will be used in the browser. You can also disable the "toolkit.legacyUserProfileCustomizations.stylesheets" option in the settings, if you think this is necessary.
Video How to install a theme for Firefox

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