Your wording could have been better but I have to agree with the sentiment that FF is the new IE. There are so many unfixed bugs that have been ignored for years. They just work on edge case new features instead.
Thanks for your work. I know there are people like you who work hard on fixing bugs but it seems to be the minority of Mozilla's effort.
Here are some open bugs which affect sites I work on, one which was opened in 2000. I don't understand how having a bug open for 13 years is acceptable.
If you have a pet bug that badly needs fixing, though, I can help you get started, if you are interested.