Would help to link to such a page.
Oddities like "George Bushâ??s" often result from people pasting text straight from Microsoft Word without disabling its "smart quotes" feature. The results can be ugly. This is a problem on their end, not yours.
It is also conceivable the page is being rendered with the wrong encoding. I don't know where Firefox puts this option, but it's probably under View or something like that.
If you were missing the font the page called for, your browser would just use its own default.