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Stylish stops working in Firefox in Private Mode

edited January 2018 in Stylish Firefox

I recently activated private mode permanently in Firefox and I noticed that Stylish isn't working anymore. :o3 Anyone else had this issue and knows a solution or a workaround for Firefox? My Firefox is the newest version, 57.0.4.


  • This is a problem with all extensions that use IndexedDB for storage. Firefox blocks access to IndexedDB storage in private windows, even by extensions.

    If you like automatic private browsing more than you like convenience, you can create a new folder named chrome in your Firefox profile folder, and copy/paste your style rules to a new file named userContent.css which Firefox will read at startup.

    More info:

    Optionally, you can create a file named userChrome.css -- chrome refers to the user interface parts of Firefox, content refers to web pages. I created a website for that file which shows where to create the chrome folder, so that might be helpful for general orientation.

  • edited January 2018 Chrome

    Or you can switch to Stylus, which works in private mode. As well as inside mixed private/standard/container tabs.

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