At this point, I have basically given up on the extensions I care about working correctly in the future. These addons (tree style tabs, tab open/close control)

At this point, I have basically given up on the extensions I care about working correctly in the future. These addons (tree style tabs, tab open/close control) already have webextension versions, but are extremely buggy for me, and I believe that is unfixable because the asynchronous nature of webextensions is fundamentally incompatible with changing browser behavior on that level. It's now up to a point where I dread opening a new page, and it takes a couple of tries before a tab is in the right position in the tree, if it works at all. Sometimes they just land wherever, not even forming a correct tree anymore, old tabs reappear, and on an extension restart the whole tree is jumbled up. So, to me, the whole Quantum era has been kind of a big disappointment.