Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and

• Remove Cookies
  Warning ! ! This will log you out of sites you're logged in to.

Type about:preferences<Enter> in the address bar.

• Cookies; Select Privacy. Under History, select Firefox will Use Custom Settings. Press the button on the right side called Show Cookies. Use the search bar to look for the site. Note; There may be more than one entry. Remove All of them.
• Cache; Select Advanced > Network. Across from Cached Web Content, Press Clear Now.

If there is still a problem, Start Firefox in Safe Mode {web link} While you are in safe mode;

Type about:preferences#advanced<Enter> in the address bar.

Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.

Poke around safe web sites. Are there any problems?

Then restart.

You can check for corrupted and duplicate fonts and other font issues: http://www.thexlab.com/faqs/multipleappsquit.html - Font Book 2.0 Help: Checking for damaged fonts http://www.creativetechs.com/iq/garbled_fonts_troubleshooting_guide.html

Type about:preferences#content<enter> in the address bar. Across from fonts and colors, press the Advanced button. On the bottom, turn on Allow Web Sites To Choose Their Own.

Make sure that you allow pages to choose their own fonts.

• Tools > Options > Content : Fonts & Colors > Advanced: [X] "Allow pages to choose their own fonts, instead of my selections above"

You can check the gfx.downloadable_fonts.enabled pref on the about:config page and make sure that it is set to true (if necessary double-click the line to toggle its value).

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

Thanks guys - will try all the above & let you know if anything worked!  :)

Update:

I tried all of the above suggestions to no avail. I also noticed that on my older document, the fonts all showed up properly. Then I created a new document, and again, the fonts initially showed up as the same. Well I just checked it and the fonts showed up on that one properly too! So my question is, why would the fonts show up correctly in one document, but stop loading in another?? I'm enclosing screenshots so you can see the difference. Thanks again for any help/suggestions!!  :)

You may have zoomed the page(s) by accident. Reset the page zoom on pages that cause problems.

• View > Zoom > Reset (Ctrl/Command+0 (zero))

• http://kb.mozillazine.org/Zoom_text_of_web_pages

Thanks but by accident I found the problem, when I clicked on the 'Add Ons' tab at the top of my Google document, it errored & prompted me to reload the page - voila! the fonts magically reappeared as their normal selves! So apparently this is a Google bug after all! Problem solved, thanks again to all of your suggestions/help!  :)

As long as the problem is gone, Right ? Safe Surfing.