It's also worth mentioning that Firefox doesn't force you to auto-update add-ons, but Chrome/Chromium do. (There was a hack workaround to keep Chromium from updating, but I forgot what it was or if it still works. It wasn't a trivial option in the browser itself like it should be.)
I use a certain extension. An update turned the extension into payware, locking 90% of the features behind a paywall. So I refuse to update it and instead continue to use the revision that still has all the original features. I would be absolutely incensed and outraged if my browser insisted on forcing me to update this extension!
Surely there are better ways for a developer to make money off of an existing extension without suddenly locking previously available functions behind a paywall. Perhaps instead paywall NEW features? Or ask for donations?