Firefox is sometimes displaying websites without css.
When I try to view pages in Firefox, the css- and javascript-files aren't always loaded after the first page load. This will cause plain text-pages. Sometimes it takes more than 5 reloads before those files have been loaded. I'm using the latest Firefox at a Mac Snow Leopard laptop.
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View | Page Style and make sure "Basic Page Style" is selected.
Also, update Flash. The version you have installed at the moment is out of date. Download from http://get.adobe.com/flashplayer/
If after updating, the problem persists, try running Firefox in Diagnose Firefox issues using Troubleshoot Mode. If it functions properly in that configuration, then one of your add-ons is the culprit.