I cannot install addons with 4.0b12!

I've been trying to install Stylish from addons.mozilla.org for the last few hours and after clicking the link I am asked to restart as usual. However upon restarting the addon is not there and it's as though I have not done anything at all. I've tried installing from a file as well and the same issue occurs.
I emailed the developer about this and he suggested it might be a problem with firefox and upon further inspection I don't seem to be able to install any addons. I've been through the 'unable to install addons' FAQ and it has not proved helpful as all of my about:config settings are as they should be and I also tried deleting extensions.ini/rdf (could not find .cache) in my user profiles folder.
Can someone please tell me what might be going on? It's driving me crazy. Note: this also appears to be happening on 3.6.14, which is still installed.

I figured it out. When I was using firefox 3.x I'd installed an addon called Memory Fox to cut down on ram usage as it would habitually creep up to 1GB+ during the course of a day, well when I installed 4.0b12 I deleted the addon, but not the external application that runs in the background. I noticed it was still running, ended it via the task manager, and now everything works and I can install addons again!
I am glad I don't need to create a new profile as that's a royal pain :X

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