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Websites which "need" chrome
(feddit.org)
A place to discuss the news and latest developments on the open-source browser Firefox
https://webcompat.com/ to report. (Also in the menu: "Report broken site".)
Who are these people? What can they do?
They are the collective main browser makers, including Mozilla. One thing Mozilla can (and does) do is insert site-specific workarounds (e.g. changing the User Agent), and/or work with the website to ensure compatibility.