The main question is what behavior is being introduced. I haven't researched deeply, but apparently the add-on does nothing until the user opts-in on studies.
It adds some css to a list of words:
https://github.com/gregglind/addon-wr/blob/da464ac8f1c3b0894...
mozilla is rapidly burning through over a decade of hard-earned trust and goodwill. i install firefox on other people's machines. i'm not a good user to piss off.
am i gonna have to wait for servo to mature and make an unmozillad servo? what a sad reality that would be.
this is not the browser we were looking for.
no, it is not, because i signed up for nightly a decade ago when mozilla still had my trust and admiration. i signed up to help mozilla find bugs before they hit end users. i signed up for new web platform features and bug fixes. i signed up to see the perf and ui improvements.
what i get force-fed now is an additional mystery platter of ad experiments, privacy erosion, forced third-party integration, random auto-addons and who knows what else at this point - they can literally push anything behind my back. the absence of all of these things is the exact reason i have stuck with firefox. i guess this relationship is not meant to last.
as another comment says in this thread, it's literally the "Windows 10 of browsers". Want faster perf and more security? Just sign up for the next version with more ads, less privacy and random third party services we auto-push to you. I know Chrome does this too, which doesnt make it ok for mozilla - it just leaves me with 0 options. if i had other viable options, i would leave quietly and never post this comment.
If your problem is with the actual _release_ version of firefox, that's a completely different complaint, and you have lots of choice in terms of getting the Firefox codebase but without some of the stuff that Mozilla feels is appropriate to put on top. If that's the level of control you want, then there are actually several options for you.