I customize mine to the point where when I have to switch it's a huge pain in the ass!

I feel you. Only thing I do nowadays are the bookmarks and an ad blocker. Nothing else so if and when things go sour, I don't have to bang my head to the keyboard.

for example Opera is my browser for all things STEEM and some related crypto stuff.

I do that too. One for fun, one for work, one for spammy pages, one for something else. And if I need to, every browser for testing sites. But you clearly know your browsers so I'll ask your opinion if I decide to abandon Vivaldi some day.