Firefox 1.5 - Find in this Page still doesn't work right?

[Jeff7]

Screenshot

I think the problem will be apparent rather quickly. This happens intermittently, and not always on the same page. That page right there for example - I opened a few other tabs to do a Google search on the problem, and when I switched back to the thread, I refreshed the page, and the Find feature worked.
What gives?

 

[imported_jb]

weird extension conflict?

 

[Jeff7]

Possible, but I wouldn't know which ones. I've only got 32 extensions.