Hi, it is possible I think to change it with userChrome but I do not know the code to do that.

• https://www.userchrome.org/what-is-userchrome-css.html

There is this :

• https://addons.mozilla.org/firefox/addon/theme-font-size-changer/

Do you mean you installed a lightweight theme to add a background image to the toolbar area?

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

You can look at the lightweightThemes.usedThemes pref on the about:config page to adjust the text color used by this theme. This pref stores data of all available themes in JSON format. You need to close and restart Firefox to make the change effective (you might be able to test the change in a new window).

• lightweightThemes.selectedThemeID
• lightweightThemes.usedThemes