Pour utiliser les extensions Android, vous aurez besoin de Firefox pour Android. Pour découvrir les modules complémentaires pour Firefox, veuillez visiter cette page.
Many users have this issue with WebExtensions, I'm not sure what's the problem, I think it has something to do with addon signing and I hear Mozilla is working on it.
You can set "xpinstall.signatures.required" in config to false as a quick workaround, or wait until it's resolved.
