Since upgrading to Firefox 18 from Firefox 17, the fonts look very blurry when a page is loading. This can be the same webpage, or a different webpage in another tab.
If the webpage loads quickly, it is difficult to see the blurry fonts. However, it is specially noticeable if I am reading an email in Gmail, and then start loading a page in the background (e.g. by middle-clicking a link in an email). The fonts of the email will become very blurry.
This does not happen if zoom is not enabled. However, obviously, I need zoom enabled as the fonts are too small otherwise.
Check with your font options
If you zoom pages then the result can always be unpredictable.
Does this only happen if you zoom the page, either will a full and with a text zoom (Zoom Text Only)?
Does this also happen with these extensions?
You can alternatively set a larger default minimum font size, but this can cause issues with overlapping or disappearing text on pages that use absolute values for container height.
I have this problem too. I tried many settings, direct draw, hardware acceleration etc, but it does not help. The only solution for now is to revert back to Firefox 17. I wonder why there is no massive outrage on the internets. Everyone uses Gmail, right? And Gmail fonts are broken too.
No, it happens with random sites for me. I never use zoom. For example, it happens on twitter, when I expand a tweet. Suddenly all the fonts become messed up. And it happens on other sites too. I tried fixes, found on the internet, but none of them worked. It seems to be some rare and dependable bug. My system: Xubuntu 12.04.1, amd64, FF 18.0.1. There is no problem on Windows, btw.