"Fast enough" is relative, and for most people when it comes to web browsing only the fastest is fast enough. I can't blame them, with all the time spent on the web the seconds add up. Firefox has been quite a bit behind Chrome in usage for awhile now, and developing a reputation as the slow browser you use if Google starts creeping you out too much.

Personally it got me to start running Firefox again. I probably wouldn't have bothered if they hadn't been making such a hubbub about it.