Does not update tab icons. I think it has something to do with conjunction of other extensions like `Tab Session Manager`, `MySessions`, `Group Speed Dial`. If try to restore the last session from the builtin menu: `History->Restore Previous Session`, or by the extension `Tab Session Manager`/`MySessions`, then the opened tabs has no icons. This extension does not restore them. Gave 3 stars only because it may does better in future.