I switched to waterfox for quite awhile.
I've lost trust in mozilla when they bundled "Pocket" and people then didn't think much of it.
When you lose ability to control the browser its no longer a fair game. Bundling addons, changing settings, ads and "enhancements" no one asked for, all eroded trust.
Not to mention its aping Chrome more and more each version.
We need more firefox forks, not less. Chrome has dozens, because the privacy threat from google is obvious: firefox hdoesn't have that much forks,because its trusted by distro makers to be safe(but its not, as mozilla just proved).
People are upset when this implicit assumption that Firefox is the only browser(among modern graphical browsers) you can trust is actually false.