@marialeal to be fair Quantum still adapts more than Vivaldi, even if not all knobs are there you can add them if needed
it's not the level of real Firefox, sure, but Vivaldi isn't as hackable and Chromium extensions, even Mv2, are wore than WebExtensions

and yeah, I'm not a fan of Mozilla since their poor communication,broken promises and such in 2016-2017, but the software itself just does what I need it to, which I can't say about any other browser