Thanks for this! I'll toss the info their way and see what they say. As far as I understand from trying to troubleshoot and discuss with them, the really only viable solution is to have all of their tabs visible at once "just like Chrome", so I don't know if the tree-style tabs plugins will fit their needs, but it can't hurt to suggest it.
I really do appreciate the input; It can be frustrating (as an autism myself) to ask "Hey how do I do A" and everyone responds with "don't do A, do B or C instead" but I have to do A for a very specific set of reasons. Even still, it's nice to see that everyone is at least pitching in with extra info and advice, just in case.