Mozilla has invested tons of resources in improving web security, sometimes even when it hurts them. A good examples is the anti-tracking stuff that break some

Mozilla has invested tons of resources in improving web security, sometimes even when it hurts them. A good examples is the anti-tracking stuff that break some badly coded (sometimes intentionally!) pages. Users may have left FF for chrome thinking it was not compatible with their favourite sites. Anyway, if you are a web developer please test your code with FF and anti-tracking enabled (Mozilla has some good documentation on this). If you are a user make sure to contact site owners and complain instead of just going to a less privacy preserving browser. (Not saying mozilla is perfect, they also try to do some shady stuff sometimes. But right now at least their privacy/security teams are doing some really nice things) Edit: going back to your original question, yes there have been incidents. And some outright abuse.