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At least until 82 I (have to try if it still works), I used: about:config xpinstall.signatures.required -> false zip -0 mywebext.xpi manifest.json *.js *.

• AlexITC 6y ago
  That worked for me only after including this snippet on the manifest: "browser_specific_settings": { "gecko": { "id": "example@gmail.com" } }