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Firefox requires you to create a developer account. And, obviously, install firefox. https://extensionworkshop.com/documentation/publish/submitting-an-add-on/

• 5350-uiop-1130 2y ago
  > "Go to Add-ons Developer Hub and click Submit Your First Add-on or Submit a New Add-on. You reach the following page:" that's for publishing. i'm just talking about the simple act of porting an extension and running it locally. you cannot do that at all in safari without xcode and an account to sign,