I don't agree. Firefox once had almost 30% market share. A lot of people explicitly downloaded and installed it, when IE was dominant and Linux almost non-exist

I don't agree. Firefox once had almost 30% market share. A lot of people explicitly downloaded and installed it, when IE was dominant and Linux almost non-existent. What happened? Those people suddenly became stupid or tech illiterate? Take into account that or has lost not only in market share, but also in absolute number of users. Mozilla has its fair share of blame here.