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Firefox Color "New Tab Background Color" reverts to black when theme is changed.

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If I'm using "Blue Theme by Valou" and then change the "New Tab Background Color" to a light blue (#b7dff0), the theme changes (when I don't want it to) and the "New Tab Background Color" does indeed change to light blue. Unfortunately, when I re-select "Blue Theme by Valou" by disabling the unwanted theme and enabling "Blue Theme by Valou", the new tab background color reverts to a default slate (nearly black) color -- the light blue background is no longer honored when I open a new tab.

Please let me know if you need more information.

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Yeah, I really hate this BLACK background. It just changed from WHITE to BLACK today..I want it back to WHITE with black font please..show me how to do that.

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Hi MTCali, Firefox 96 now harmonizes more parts of Firefox with your toolbar theme. When the text color on your background tabs is light/white, it triggers Firefox to use a dark background on menus, the sidebar, the Library window, and various built-in pages. Firefox also signals sites that you have a dark theme preference.

What to do about this

The fastest workaround for now is to change your theme to one that uses dark text. By dark text I mean, for example, the built-in Light theme, or an add-on theme with black or dark text on the tabs such as:


I have attached a screenshot illustrating the difference between a theme with light text on the tabs and dark text on the tabs.

If you are looking around at other themes, look for the ones with a darker bar representing the tab bar text in their preview:

For those who want to keep their current theme...

Background / Other Settings

Firefox 95+ is taking more and more cues from your toolbar area theme for how to style other aspects of the browser. There is a setting for some of these, but not all of them.

(A) Right-click context menus, toolbar drop-down panels

Starting in Firefox 89, these would flip to a dark background if the text on the inactive/background tabs was white or light. Firefox 96 has extended this adaptation to more parts of the browser. As far as I know, the only built-in way to avoid this is to change your toolbar theme to one with dark text on the inactive/background tabs. (The other way is the not-officially-supported userChrome.css file route.)

(B) Built-in pages, and websites that have light/dark responsive themes

Starting in Firefox 95, Firefox would inform pages that you preferred a light/dark theme based on your Firefox toolbar theme instead of your system theme. There is a way to decouple your page (content) theme preference from your toolbar theme. At this point, it's only available through the back door...

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

More info on about:config: Configuration Editor for Firefox. The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.

(2) In the search box in the page, type or paste layout.css.prefers-color-scheme.content-override and pause while the list is filtered

(3) Double-click the preference to display an editing field, and change the value to whatever you prefer from the list below, then press Enter or click the blue check mark button to save the change.

  • 0 => Force a Dark background
  • 1 => Force a Light background
  • 2 => Follow the System theme (default in Firefox 94)
  • 3 => Follow the Browser toolbar theme (default in Firefox 95+)

The about:config page should immediately reflect your saved change.