Tried it as i couldn't find the previous app. I just definitely lost my 1500 tabs by closing the hundred which were supposed to be double. Before that, for some reason when i wanted the list of the double, it re arranged all my tab.
Now i have to start again and some website are lost as i can't "open back closed tab". Well i can, i just won't open the child tab and tab that weren't open at that time.

Does nothing at all on android. No toolbar access, nothing under tools menu, nothing in about:config.