Option to remember the state of custom collections

[Joyfulbeekeeper]

I have a lot of custom collections, but sometimes I want to view regularly only some of them (for example, on esports tournaments).
It would be nice to have ability to remember the state of collection (collapsed or expanded). At least from the last session (if I collapsed the collection "Dota 2", it should remain collapsed next time I open the extention), ideally there should be tweak options for every collection.

Nice idea would be to display number of total online followed streams and total viewers next to collection name., like:

"Dota 2" - 13 (27306)

Which means that my collapsed Dota 2 category has 13 streams online from people I follow, and total number of view on them is 27306 people.

P.S. Plus, add buttons "Collapse all" and "Expand all" somewhere near "Sorting" menu. It's annoying to collapse/expand every of my 10-15 collections every time in "followed online streams" and "followed users"