You'll need to use Firefox Developer Edition, Nightly, or ESR. Then, go to about:config and set xpinstall.signatures.required to false. https://extensionworksh

You'll need to use Firefox Developer Edition, Nightly, or ESR. Then, go to about:config and set xpinstall.signatures.required to false. https://extensionworkshop.com/documentation/publish/signing-and-distribution-overview/#signing-your-addons https://extensionworkshop.com/documentation/publish/signing-... You can then sideload unsigned add-ons by following these instructions: https://extensionworkshop.com/documentation/publish/distribute-sideloading/ https://extensionworkshop.com/documentation/publish/distribu...