It's not about being mad. Mozilla created a culture around their browser and how it worked, how it was updated, how add-ons worked and were programmed. The problem is that they created a culture, and now are going against everything they created, because they've lost sight of where they started and why.
I started using Firefox (for the second time) when it was Netscape 4.0. Remember a time when Mozilla didn't give users the impression that it was just trying to copy Google in every possible way? Good times...
The only thing keeping me with Firefox is HTTPS Everywhere (https://www.eff.org/https-everywhere), and being able to clear the cookies/cache on exit. Give me another cross-platform browser with those features, and Mozilla is going to have a hard time convincing me to stay.
You're not the only person who thinks that way. I made the mistake of creating a YouTube account for someone (else) while I was logged into my Gmail, and it automatically (without prompting or warning) linked the two accounts (do a search for "unlink google and youtube accounts" for horror stories). If you do that nowadays, you can't "unlink" the accounts in any way. All you can do is delete an account and recreate it. Of course, once a Google username is taken, it can NEVER be used again, because you don't "delete" accounts with Google, you just "inactivate" them, which makes them permanently unusable. My only complaint is that we're not given the choice when we create new accounts. If we had that, it wouldn't be a big deal, but this is like the Buzz fiasco. Hopefully Google learn quickly this time, too.