Forced updates is absolutely lame
Was forced to upgrade to version 65 which broke the tabs on bottom setting. Tried to install a ESR version but it kept crashing. Went back to version 64 which was immediately forced to upgrade to the broken version again (which I didn't allow).
The problem is this. The people who have implemented this forced upgrade feature are probably using Windows 10 (forced updating) and are used to being treated like second class citizens by Microsoft. Forced upgrading is completely inappropriate. I've used browsers since Netscape, all of the Firefox versions, rarely use any other browser. Never had a problem except with your forced updates.
Lucky for me I found the registry fix for admins to disable updates. Reasonably inconvenient but a hell of a lot better than putting up with forced updates that break the browser.
How about bringing back the choice to upgrade. How about, at least giving two reminders to upgrade and then disabling the messaging. This messaging is extremely disrespectful - i.e. we are going to keep on annoying you until you upgrade (to a broken system).
The people who answer questions here, for the most part, are other Firefox users volunteering their time (like me), not Mozilla employees or Firefox developers.
If you want to leave feedback for Firefox developers, you can go to the Firefox Help menu and select Submit Feedback... or use this link. Your feedback gets collected by a team of people who read it and gather data about the most common issues.
The fix for "tabs on bottom" for Firefox 65 is here: https://support.mozilla.org/en-US/questions/1248277#answer-1192325
The "choice" to disable updates via a preference within Firefox has been removed, and I doubt if Mozilla is going to reinstate that preference. There are other methods to disable updates, as you have figured out.
As far as "annoying you" in an attempt to change the status quo - that is just playing rude to the people who provide support here. None of us work for Mozilla, we are for the most part just other users of Firefox who volunteer our time to help other Firefox users; "we" have little to say about Mozilla policies with regards to updates. But treat us right and we could provide an easier way to disable updates, if you would treat us with respect.