Sounds annoying. Did you try through the firefox (registry) - about:config? Failing that you could try something like Firefox Nightly.

I eventually got it, but I did end up doing the registry and mucking out some bits in /etc. Then I figured, "hey, I haven't tried Debian yet." So that's probably my next step... but it's looking like if you want it done right you're going to have to compile it yourself :/