I installed an addon named Chat Resizer, which is for Kongregate, restarted to finish the install and firefox would not open. Clicked it and clicked it nothing, Opened Task Manager, Ended the firefoxes and tried to open it again but nothing again. Started FF in safe mode, cannot remove chat resizer with greasemonkey disabled, trying to enable it to remove it firefox refuses to start. Uninstalled greasemonkey, FF works as normal, install it and it freezes once more. Removed files from user/appdata/roaming/mozilla/profile blah blah/gm_scripts which had files for all of my scripts in them, Firefox still won't start, uninstall greasemonkey, works again, install, doesnt work even with files for the scripts gone.

Any more suggestions?