2626: remove useragent.compatMode #368
2626: remove useragent.compatMode #368

I see no point in keeping this to enforce a default that FF itself doesn't use - see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent/Firefox
-  "... is an optional compatibility token that some Gecko-based browsers may choose to incorporate, to achieve maximum compatibility with websites that expect Firefox"
ghacksuserjs/ghacks-user.js,ghacksuserjs/ghacks-user.js