I started using Firefox ages ago because of firebug. I’ve been using it as my primary browser ever since. I’ve never had an issue with it (other than the occasional web site that is designed to only work with Chrome). Maybe I don’t know what I’m missing since I haven’t given Chrome a try (other than loading the occasional website that only works on Chrome). Maybe Chrome is better than Firefox, but I don’t have any complaints about Firefox (though I do have complaints about bad website developers).