Memory leaks Rated 4 out of 5 stars
This is a great extension, but it has memory leaks. I use it alongside TabUtils and about 30 other extensions, and see no conflict, even when I have hundreds of tabs open, either active, suspended or hibernated.
The only problem is TGM produces a steady increase of memory (PrivateBytes and VirtualSize in Process Explorer), until it starts thrashing my swap file and eats away at my youth. The leaks appear to occur during automatic timer-backups. After the GarbageCollector finishes its job, I see an increase of 5-10 MB for each timer-backup, and also a steady increase of 50KB every second, all this until the next garbage collection. Sometimes I get from 500MB up to 1.1GB, just from the work of TGM (no interaction with the browser).
It makes no difference if I use FF3, FF4, or Palemoon. This coupled with the other memory leaks in FF (where closing all tabs does not release all their memory) makes it a really sad experience for tab-happy people like me.