What does HackerNews think of Chrome-Store-Foxified?
Point and click to install extensions into your browser from the AMO, Chrome Web Store, Microsoft Store, or Opera Addons websites.
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There used to be https://github.com/Noitidart/Chrome-Store-Foxified, but it has been unmaintained for years
Have you looked into Chrome Store Foxified? It automates the conversion, signing, and installation of extensions from the Chrome Web Store into Firefox. https://github.com/Noitidart/Chrome-Store-Foxified (It wasn’t working for a while but it seems that a fix might have finally been discovered.)
You can install Chrome extensions as-is and 99% of the time they just work. There was a helper addon for fetching from the chrome store: https://github.com/Noitidart/Chrome-Store-Foxified — temporarily needs an older firefox copy to work. But you can always repack manually.