3px framed picture on a Web page with Internet Explorer and Google Chrome appears normal, but Firefox is on the right side frame 9px. Why?

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.