This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

all themes set to dark

  • 2 uphendule
  • 1 inale nkinga
  • 1 view
  • Igcine ukuphendulwa ngu cor-el

more options

I have noticed that suddenly all the themes on all websites, like github and startpage, are set to dark theme. I didn't set them to dark mode at any point and don't want them all to be dark. Some websites say that they use system settings for default theme. I do not remember changing any settings in my OS(Ubuntu) or in the mozilla browser.

I have noticed that suddenly all the themes on all websites, like github and startpage, are set to dark theme. I didn't set them to dark mode at any point and don't want them all to be dark. Some websites say that they use system settings for default theme. I do not remember changing any settings in my OS(Ubuntu) or in the mozilla browser.

All Replies (2)

more options

Hello,

Firefox detects the os theme. Your (most likely) GTK theme is dark, as that is the default for gnome (and annoying to change).

To force this to be different, you must make an about:config tweak.

WARNING from the moderator team: Changing Firefox pref from the about:config page can sometimes break Firefox or cause strange behavior. You should only do this if you know what you're doing.

Please read Firefox Advanced Customization and Configuration Options to learn more.

You must go into the filter bar and paste ui.systemUsesDarkTheme then click number, then enter 0 to force Firefox to think that your system uses light mode.

more options

You can change this pref on the about:config page from 3 to 2 to revert to the Firefox 94 behavior.

  • layout.css.prefers-color-scheme.content-override
    Dark (0), light (1), system (2) or browser (3)

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.