Probably more relevant on desktop than on mobile:
I have a separate tab group for soccer-related websites, but my RSS reader is in the "main" tab group (because it covers way more than just one subject). Now I would like to see a way to have websites clicked in the RSS reader opened in the soccer tab group instead of the "main" tab group automatically. Right now, I'll have to move them manually (unless I am blind and can't see an obvious button for that...).
It would probably be a good idea to have the user enter URL patterns for each tab group.