Is that happening only in that part of the Firefox user interface?

How did you change the font size of the others?

• I have changed the font for my main menu and page content

Thank you for your response, Cor-el. I used Control Panel to check and ensure that my display settings were correct. They were. I can use the <ctrl>+ and <ctrl>- commands to adjust the zoom for page content, but I'm still stuck with enormous fonts in the toolbar and tab headings. The font sizes are all as they should be in all other applications. It's only in the tab headings and url/toolbar of Firefox where the settings are off.

I have exactly the opposite problem...my fonts in the Menu Bar Headings and Bookmarks Tool Bar are now so small I can hardly read them...there is no OPTIONS available in the THREE BARS where I should be able to go in and change the font size...all ZOOM does, which works fine, is change the font size in the website area...and clicking on ZOOM TEXT ONLY doesn't make it bigger, because it isn't open in the other Bar areas I have described.

RanchInNevada

Try using this extension" https://addons.mozilla.org/en-US/firefox/addon/theme-font-size-changer/

Try to set layout.css.devPixelsPerPx to 1.0 (default is -1) on the about:config page. If necessary adjust its value in 0.1 or 0.05 steps (1.1 or 0.9) until icons or text looks right. Modifying layout.css.devPixelsPerPx acts as a global zoom and affects the user interface and web pages and you may have to adjust the appearance of web pages.

You can look at the Default FullZoom Level or NoSquint extension to set a default font size and page zoom on web pages.

• https://addons.mozilla.org/firefox/addon/default-fullzoom-level/
• https://addons.mozilla.org/firefox/addon/nosquint/

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config