The constant nonsense UI redesigns that come about with every new update. Ive been using Firefox since it was called Phoenix, and this is my biggest complaint.

The constant nonsense UI redesigns that come about with every new update. Ive been using Firefox since it was called Phoenix, and this is my biggest complaint. Stop hiding menu options, my monitor is bigger and you're suddenly trying to save real estate. The only reason Firefox got as popular as it did is because technical people liked it, and they encouraged their non technical friends to use it. If you're going to dumb it down then technically inclined users will not feel as pationately about it. I was personally responsible for hundreds, maybe thousands of people switching from ie to Firefox when I worked at the help desk of a small ISP. I don't think I would do the same now. It's still my main browser, but it feels like an abusive relationship.