If zoom settings are site-wide...?

...how do you get all pages on a site to the same zoom settings?

When I surf Newegg, some pages have the text way too large. Others, it's normal, but when I try to normalize the large text, it makes the pages with normal text unreadable (the text becomes too small).

Greasefire offers no solutions for Greasemonkey, so it can't be too widespread a problem.

Is there a way to reset the zoom settings, in case it's something stupid I did?