NaN is actually a number in JavaScript

Firefox because it’s one of the last browsers against the Chromium monopoly.

Also UBlock Origin is wayy better on Firefox, even before Google forced their version of Manifest v3 on all Chromium based browsers.

Isn’t that known since the early 2000s?

Bad enough that they covered that up for 50 years or so. They knew that the chemicals needed to produce PTFE (Teflon) are toxic but still covered that up and said they’re harmless.