"Mozilla ditched Yahoo recently however in favor of Google, two years before the five year contract would be up for renewal. The terms of the new deal with Google have not been revealed yet, and it remains to be seen whether this new deal will give Mozilla's revenue another boost in 2017." Apparently Firefox 57 when it is installed tries to switch the users default search engine to Google. Whether it asks for user pe…
It certainly did not ask for me and just switched from startpage to Google. Also auto-installed the update (against my will) after I had voted to wait a few times, though that might have been autoupdate as it was on my work computer (have heard from others that it was not which I also suspect but I am too lazy to check). Mozilla is certainly losing trust with that, if it weren't for the lack of good alternatives...
How do you disable the auto update? For now I've manually installed an older compatible version.