The bootstrap.js script should contain several specific functions, which are called by the browser to manage the extension. The script gets executed in a privileged sandbox, which is cached until the extension is shut down. For more information, see Bootstrapped extensions.
The example below contains the required methods in vsdoc format.
function startup(data, reason) { /// Bootstrap data structure @see https://developer.mozilla.org/en-US/docs/Extensions/Bootstrapped_extensions#Bootstrap_data /// string id /// string version /// nsIFile installPath /// nsIURI resourceURI /// /// Reason types: /// APP_STARTUP /// ADDON_ENABLE /// ADDON_INSTALL /// ADDON_UPGRADE /// ADDON_DOWNGRADE } function shutdown(data, reason) { /// Bootstrap data structure @see https://developer.mozilla.org/en-US/docs/Extensions/Bootstrapped_extensions#Bootstrap_data /// string id /// string version /// nsIFile installPath /// nsIURI resourceURI /// /// Reason types: /// APP_SHUTDOWN /// ADDON_DISABLE /// ADDON_UNINSTALL /// ADDON_UPGRADE /// ADDON_DOWNGRADE } function install(data, reason) { /// Bootstrap data structure @see https://developer.mozilla.org/en-US/docs/Extensions/Bootstrapped_extensions#Bootstrap_data /// string id /// string version /// nsIFile installPath /// nsIURI resourceURI /// /// Reason types: /// ADDON_INSTALL /// ADDON_UPGRADE /// ADDON_DOWNGRADE } function uninstall(data, reason) { /// Bootstrap data structure @see https://developer.mozilla.org/en-US/docs/Extensions/Bootstrapped_extensions#Bootstrap_data /// string id /// string version /// nsIFile installPath /// nsIURI resourceURI /// /// Reason types: /// ADDON_UNINSTALL /// ADDON_UPGRADE /// ADDON_DOWNGRADE }