kind of, but more "your original complaint is about a release channel intentionally designed to give you all the latest features turned on by default, including experiments", which has been true since the release/beta/nightly channels were set up. If you don't like something Mozilla did to the browser in nightly, you file an issue in bugzilla, and if you missed this and discovered it too late, then that's a consequence of being a single human being who can't discover every single that is introduced every single day when nightly gets updated.
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.
