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Firefox is fine. The people running it are not
(www.theregister.com)
This is a most excellent place for technology news and articles.
It's ironic that I use Firefox personally but unfortunately we prioritized Chrome when I did more front end work too. Firefox would often render views differently compared to Chrome (Safari was also a shetshow) and we had to prioritize work ofc, especially for legacy stuff.
The thing is, as a pure guess, I would bet that it's Chrome that's not adhering to the web standards.