I'm not seeing this.

Reset the page zoom on pages that cause problems: View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac)

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

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot

Use a compressed image type like PNG or JPG to save the screenshot and make sure that you do not exceed the maximum file size (1 MB).

Below is a screenshot.

Are you zooming the page?

I see those extra px appearing like in your screenshot with some specific zoom factors, but not if I reset the page zoom.

See also:

• https://developer.mozilla.org/en/Images%2C_Tables%2C_and_Mysterious_Gaps

Resolved the problem with the new version (Firefox 4.0.1) browser. Thank you for your interest.