You could try setting the preferences in about:config. Open a new tab, enter about:config in the url bar, accept the risk and enter the colours you want.

WARNING: Changing preferences through this interface not officially supported Hidden settings edited using the about:config tool are explicitly not supported, which means that Mozilla makes no guarantees they will be supported in the future, or that Mozilla will fix them if they break. Mozilla does not test these preferences, and will not in the future. That includes security and performance testing which these preferences may affect.

[Warning added by moderator.]

browser.display.background_color browser.display.foreground_color browser.anchor_color browser.visited_color

You can also use bookmarklets to substitute a colour for a white background or to set colours for the page. The latter will stop you seeing images so I'll give you a link for the former in a separate reply. You have to use a bookmarklet each time you load or reload a page.

As it happens, they are on the same page: https://www.squarefree.com/bookmarklets/zap.html

I tried adjusting the specified values in "about:config", but it had no effect.

I am pretty sure there is a bug that was introduced recently.

hii

rocket42au,

1.Clear the cache

• In the Menu bar at the top of the screen, click Firefox and select Preferences. ...
• Select the Privacy & Security panel.
• In the Cookies and Site Data section, click Clear Data….
• Remove the check mark in front of Cookies and Site Data. ...
• With Cached Web Content check marked, click the Clear button.

https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

2.Update Firefox browser

• Click the menu button in the top right corner.
• Click the Help button.
• Select About Firefox.
• Click Check for updates.
• Click Update.
• Click Restart Firefox to Update.

if you probelm is slove please response me

Thanks Regards -Arman

When I test with this hideous combination, it works, at least on the new tab page and web pages:

It doesn't seem to work on the Settings page itself or on about:config for some reason. Maybe that's because I have the "System Theme" enabled with a light Windows theme. Which Firefox theme are you using? Use themes to change the look of Firefox

I am using the dark theme. Thanks.

I am using the dark theme. Thanks.

Are there specific pages that do follow the theme and your settings, or do you have the problem on all pages?

For example my travel blog has a dark background and you would expect that your color settings would override this to your assigned colors: https://www.jeffersonscher.com/ttw/

(Default appearance)