Except that the browser is missing a lot excepted features and historically positioned itself as "just pile extensions on top of FF to get features we won't add

Except that the browser is missing a lot excepted features and historically positioned itself as "just pile extensions on top of FF to get features we won't add or have removed". adblock ? disable javascript ? mouse gestures ? download manager ? privacy protection ? duplicate tab ? and so on all are extensions because mozilla refused to implement or removed those features.