I run a multi-monitor setup (5 monitors) on which I usually have 2-4 browser windows open on separate monitors.While using Firefox at several times over the course of a few hours the browser slowly stops functioning correctly (slowness running pages, inability to load images) and then pages will load with portions of the page completely blacked out, scrolling sometimes reveals the blackened portions but it will black out other parts. At this point I close out using task manager. When I restart the restore session page shows up, and all the previous tabs are there for a short moment, then it seems to refresh and suddenly disappear. I've tried uninstalling/reinstalling, I reformatted my computer, I've even upgraded my graphics cards (for other reasons), removed add-ons, and scanned for malware. This issue only happens in Firefox (Chrome and IE do not have the same issue).