Firefox will not display basic content on certain (common) sites

Hi there:
On certain websites (common) ones Firefox will not display options on the website.
These sites include Yahoo Mail, Twitter, Weebly.
An example would be if there is a menu of choices such as delete, ad, tweet, etc. instead of displaying correctly it looks like a box with 4 dots.
The other browsers are fine. I have the latest Firefox and this started with the previous version as well. I uninstalled/reinstalled without change.
Windows 7 Computer/Norton Anti Virus.
If allowed I can upload a screen shot.
Thank you.

> But I really don't want to allow all sites to use
> their own fonts, just, in this case, Twitter.
Exactly. It's not a very good solution to be forced to give up control/accessibility on every Web site, to fix a problem with just a few popular ones like Twitter.
It seems like a pathetic accessibility fail on the part of Yahoo, Twitter, etc., but since the practice is likely to persist and spread, please, Firefox:
=> allow site-specific configuration of "allow pages to choose their fonts."
Tim McCormick, Palo Alto

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