Just lately I'm getting same strange and quite inconsistent behaviour on SF with Camino browser, version 2.0.9 on OS X 10.7. I suspect the problem is with Camino but as it works fine on every other site I visit I can't help but wonder if there's been some recent code change on SF that's at least partially to blame and would like to know if anyone using Camino (is there anyone?) is having issues.
The main issue is that buttons don't always work. e.g. I just posted a comment that would only post by pressing the return key. Clicking the button did nothing.
Using FireFox everything works normally and as I said, Camino works correctly on other sites.