QL has been working fine on FF19 then all of a sudden I logged in and it tries to download the plugin (maybe an update) so I download it, restart, go to log in again and it just repeats this cycle of downloading the plugin ie I can never actually log in.

I had this issue before and had to disable dom.ipc in about:config which fixed it then but can't seem to get it to work now. I've tried moving my FF profile (~/.mozilla) with completely default settings, still same thing, and for the sake of it I tried moving my ~/.quakelive and same problem. Updated to FF20... same problem.

Any ideas?