* Lack of AppleScript support (my main complaint, every other was lifted from other comments).
* Lack of other basic features such as pinch-to-zoom.
* Poor Keychain support.
* Slow.
* Resource-hungry.
And this article comes out just after reports of a 0-day exploit of Firefox on macOS[1].
If you want people to give Firefox a chance, make it good. For many of us it isn’t, and shouting over and over that it’s good doesn’t make it so. Fine if it works for you, but it doesn’t for many.
[1]: https://arstechnica.com/information-technology/2019/06/poten...