Comment by devmor

Not just unreadable - actively malicious. Every now and then I run into a website with a bunch of custom javascript that doesn't function in Firefox, and I'll have to open up Edge or Chromium (depending on what computer I'm using). Every time this happens, I'm immediately accosted with "features" or advertisements attempting to hijack my experience to sell me something or steal from me.

As long as Firefox supports the tools that protect me from the hostile behavior of websites, it will remain my browser of choice.