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As Chrome slowly takes over all remaining browser market share and more websites are becoming Chrome-only, one feature I wish Firefox had was a way to open a "Chromium tab," which would just be a tab that contains a frame of a Chromium instance so I can use these Chrome-only websites in Firefox without having to open Chrome.

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You could use something like https://add0n.com/external-application-button.html that opens the page in an independent instance of Chromium.

Many pages "only support chrome" but work perfectly fine if you switch your user agent to appear like you're using chrome

https://addons.mozilla.org/en-US/firefox/addon/uaswitcher/

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