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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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.