I recently discovered that Firefox on Ubuntu does not render well some web pages compared to how it renders them on Windows (where the rendering is correct) or even to Chromium on the same Ubuntu box (Chromium also renders them correctly).
I thought it was a problem with Ubuntu, but using Chromium on Ubuntu convinced me that it may be a problem in Firefox or a combination of Firefox and Ubuntu.
Here is a screenshot of an area of a webpage rendered with Firefox:
And here is another one for the same area but rendered correctly with Chromium under the same Ubuntu machine:
I'm using the latest stable Firefox version: 7.0.1 on the latest 11.10 Ubuntu release.
I tried to remove (totally) and reinstall Firefox but the problem persists. I never experienced this problem with previous Firefox releases on previous Ubuntu systems for the same webpages.
The screen shots where taken from http://www.builtwith.com.