Firefox Developer Edition and Nightly both support installing unsigned extensions by changing the preference xpinstall.signatures.required to false. https://su

Firefox Developer Edition and Nightly both support installing unsigned extensions by changing the preference xpinstall.signatures.required to false. https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox https://support.mozilla.org/en-US/kb/add-on-signing-in-firef...