Temporary installation in Firefox
This article describes how an add-on developer can temporarily install an extension in Firefox for testing and debugging. The extension will stay installed until you restart Firefox. You can use this method with any kind of restartless extension, including bootstrapped extensions and Add-on SDK add-ons.
Note that this is not how end users should install add-ons in Firefox. End users will install add-ons by downloading and opening packaged add-ons that have been signed by Mozilla. To learn how an extension developer can get an add-on packaged and signed, see Publishing your extension.