My firefox stops responding to any text or mouse inputs on every load. Menu's will work but the graphical response isn't normal. You don't get the hovering effect and clicking on the menu items has no response. The firefox button at the top remains in it's depressed "clicked" state, as if my mouse is still clicking it. Browser bar only accepts the first letter of whatever I'm typing. However the auto-complete suggestions drop down as normal if I continue typing. Clicking on a suggestion or pressing enter after blindly typing the URL has no result. Firefox simply does not respond as with the menus above. The search box has the same response as the address bar. Even stranger, if Firefox is left open in the background the memory use slowly climbs, as high as 1Gb used if left alone to run. No crash reports or ID. Firefox closes cleanly using the "X" and/or alt+f4. Firefox loaded in safe mode with add-ons disabled behaves the same. Removed firefox completely (including directory deleted and registry purge) and reinstalled several times, no change. Both AVG Pro and Malwarebytes scans return clean. Running Windows 7 64-bit, SP 1. Current updates, adobe and java.