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Mozilla opposes Web Integrity API proposal
(github.com)
A place to discuss the news and latest developments on the open-source browser Firefox
It's not slower, and the rare incompatibilities can be solved by changing the user agent, which shows it's artificial.
try not to ruin the user experience to make more money challenge (impossible)
They fight an uphill battle because lazy web devs optimize for Chrome and Firefox is a 2nd class citizen, but they do rock the last couple of years.
Sometimes changing just the user agent isn't enough FWIW.