I regret for upgrading my Firefox from v3.6 to v6.0.2. I did not have this issue with Firefox v3.6. My Firefox browser fonts are now too small to read on a 27" iMac screen. I have to keep hitting the command + several times to enlarge the fonts, and I have to do this on every page even if the web pages are within the same site. Take note this is on every page, not just on different sites. I've tried increasing the font size settings in the Firefox / Preferences / Content to no avail, the browser is just not taking the setting. I love Firefox but now I'm forced to use Chrome. If you have a way to make Firefox remember the font size setting please let me know. Otherwise I will have to switch. I googled and found a lot of people are having this same issue. A great browser is useless unless you can read the letters. Thank you for your attention to this matter.