@Kam i think he is talking about this new extension button in opera / chrome style (where you can pin unpin it), but maybe i understand it wrongly... at the end google didn't implement any features about extensions, they just removed a lot since 09.2020. there is no scroll mode too. so i really don't understand what other can be. or maybe is something related to the problem i wrote here ***id=1145664 (so that chrome hide extension when i resize the window). but i still don't understand how this can help, because there is no scroll mode at all.
about 2) is already on my list (i don't remember which post ...)
about 1) i don't understand the goal.
