Despite having only a fraction of Google's resources, Mozilla continues to develop a competitive browser that provides a realistic alternative to Chrome. But it has never had access to the sort of channels and budget that Google used to promote its browser.
(Of course Mozilla has made its share of mistakes. That's an inevitable part of attempting to do anything in this world. But "morally bankrupt" is not a description I recognise.)
https://en.wikipedia.org/wiki/Cliqz#Integration_with_Firefox
So, I am having trouble figuring out what are the events/changes that you are characterizing as "shannagains"?
Yes, you can disable it but why not make it a preinstalled extension that can be removed entirely.
https://vivaldi.com/privacy/browser/
EDIT: Fixed link