Karl, I have a some problems with Mozilla Firefox. I've checked this problem on 3 computers (2 windows 8.1 and 1 mac os x latest). The problem is the same.
You can see it on my website, for example on this page http://www.morgunov.ru/client/articles/ ... 6-08-2011/
Then open an image I see a broken picture. Sometimes I see a good picture. Firefox with the latest release.
In other browsers (Chrome, Safari) everything is ok.
And second problem. Fonts in the browser Firefox display incorrectly. In other browsers (Chrome, Safari) everything is ok. You can see it on my website (i.e. top main menu, content pages, headings).