''g5.taisa831 [[#question-1269910|said]]'' <blockquote> How to install? </blockquote> Hello g5.taisa831, Assuming that this is about an add-on that you developed; please see : https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Distribution/Submitting_an_add-on https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Temporary_Installation_in_Firefox https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox https://github.com/mozilla/policy-templates/blob/master/README.md#extensions https://support.mozilla.org/en-US/kb/customizing-firefox-using-policiesjson For add-on support : https://discourse.mozilla.org/c/add-ons/add-on-support