but i just wish there were some talented engineering teams at the leading browser creators (cough couch google, mozilla, MS, apple, etc) that would integrate this as a first class feature. a design goal, not a supported extension.
Firefox has a decent bookmark system. What I do usually is star it (one click) and I think you need to click it again to edit it, you can then add tags to it.
i think if there was any browser to add something like raindrop natively it would be vivaldi. they seem to do a lot things differently than other browsers