I am running Firefox version 3.0.11 on Ubuntu 9.04 on some websites, Stack family included, some text appears white and against a black background makes it invisible. If I highlight the text it comes back to its normal color for a little bit, some of the time. The text on some of the tags below is an example of my problem. What can I do to attempt to fix this. 

[![alt text](https://i.stack.imgur.com/LtRVl.png)](https://i.stack.imgur.com/LtRVl.png)

**UPDATE:** White text was still present after starting in safe mode, as well as without desktop effects. Is there any other information I can give to help with the diagnosis?