Why are Firefox fonts so tiny on KDE?

Question

I use Firefox 10 on Ubuntu 12.04, in KDE.

In for instance Chrome and Konqueror, the fonts look alright, but in Firefox the fonts are tiny, almost too hard to read.

Answer 1

There are two common cases for the fonts appearing too small in Firefox.

Case 1:

You may have accidentally changed the page zoom. Set the page zoom back to 100% by pressing Ctrl+0 or using the GUI: View > Zoom > Reset.

Note: There is a related preference in about:config for remembering page specific zoom levels. If you do not care for this feature, or frequently change the zoom level by accident, you can set the following to false:

browser.zoom.siteSpecific

Now when you go back to a page, the zoom level will be reset to 100%.

Case 2:

Your Firefox profile's font settings may have been altered. Go to:

chrome://browser/content/preferences/fonts.xul

The font size should be 16 for Proportional and 12 or 13 for Monospace.

Note: These settings can also be reached under:

Preferences/Options > Content > Fonts & Colors > Advanced

Answer 2

firefox (72) can't find "chrome://browser/content/preferences/fonts.xul"... Preferences/Options > Content > Fonts & Colors > Advanced is meant for web pages, not for tab or bookmark fonts...