@rozodru @jan, I'm not a programmer and for me there are no differences to see the sourcecode of an browserengine or an text in ancient Babylonic.
But I know that it is extremly difficult to release and maintan it. A lot of respect to all which do it, even for those with indie and text browsers like the Qute you mencioned.
But i also know, precisely for this, that it is impossible to swich easily the engine of an browser, in this case of Vivaldi, without creating all new from scratch.
As mencioned, I use the Zen browser as second, which is a Firefox fork with some few features I love in Vivaldi, but I don't see an Vivaldi like the current on Gecko with all the features it has for 6 different OS, this seems almost impossible to me.
Yes, Chromiu has this smell of Big Brother and it's the one it's use, but there isn't no other to make the best of it in the most ethical way, eliminating the Big Brother from it, which is fairly difficult enough as one of the devs wrote in a blog sometime ago, where you for sure better understand the details as I do, I think that it is for Gecko not so different.
https://yngve.vivaldi.net/sooo-you-say-you-want-to-maintain-a-chromium-fork/