I'm trying to understand this issue in case it turns out to be something I might need to know a little about. I displayed this page in both Chrome and Firefox:
There appeared to be a little bit of a difference in the fonts of the two browsers. The Firefox fonts appeared a little bit bolder because they were just a tiny bit thicker but that was all. Hitting Ctrl-+ several times didn't make any blurriness apparent in either browser.
After returning the zoom to normal I then in Firefox changed
gfx.font_rendering.cleartype.use_for_downloadable_fonts to false and refreshed the page. There was no difference I could see. I restarted Firefox, still no difference.
I put the phrase "This thread was archived" from that webpage in both Chrome and Firefox side-by-side in an image editor, zoomed in, and then I could see the subtle pixel differences that cause the Firefox font to appear a little bolder and thicker, but I should stress "subtle."
Am I just not experiencing the problem on my computer? Or is it something I'm just not sensitive to? The difference in the fonts between "Sample One" and "Sample Two" in your image is obvious and not at all subtle. Are you seeing a difference that dramatic on affected webpages?
--Percy
™ Version 4.2