All of my Tab Groups have the same App Tabs. If I delete an App Tab from one Group, it is deleted from all the others. Same for adding them. This happens even when I don't have any tab-related extensions active (normally I use TabMixPlus, but I turned it off to test this). Is this how it is intended to work, or am I missing something? Or is there a plug-in to allow different App Tabs in different Tab Groups? I'm using FF 9.0.1. on Win7.