The things you learn. The damn CDC Covid tracker won't open in Firefox. It feels like not following open standards for cross compatibility is a dereliction of duty for government agencies, let alone the official tracking app during a pandemic.

Opera 12, with the Presto engine, had this same problem. It had a huge list of overrides (JavaScript and CSS) to fix problems with popular websites.

This is inevitable when a browser has limited market share.

Wow, what a collection of hacks. It reminds me of the efforts Microsoft goes to so that old programs keep working on Windows.

I think in both cases it was less hack and more getting around browser sniffing code that makes outdated or incorrect assumptions.

Please don't browser-sniff, use feature detection instead. The web platform is standards-driven, not browser-driven -- let's keep it that way :)

I'm sympathetic to the need to do this, just admiring the kludges. It's not just user agent spoofing; some of the compatibility hacks seem to be modifying CSS of websites.