gistfile1.js

function renameAddon(addon, name) {
    if (!name) {
      return Promise.reject('no name given');
    }

    if (!isAddon(addon)) {
      return Promise.reject('not an addon');
    }

    var manifest = getManifest(addon);
    if (name === manifest.name) {
      return Promise.reject('name is unchanged');
    }

    return new Promise(function(resolve, reject) {
      addon.manifest.name = name;
      addon.export().then(function(blob) {
        var request = navigator.mozApps.mgmt.uninstall(addon);
        request.onsuccess = function() {
          install(blob).then(resolve).catch(reject);
        };
        request.onerror = function() { reject(); };
      }).catch(reject);
    });
  }

  function install(blob) {
    return new Promise(function(resolve, reject) {
      // Save the blob to a file because we don't support importing memory blobs
      var sdcard = navigator.getDeviceStorage('sdcard');
      // Delete the tempfile from the SD card.
      var deleteRequest = sdcard.delete(ADDON_FILENAME);

      deleteRequest.onsuccess = deleteRequest.onerror = function() {
        // Add the addon blob to the SD card using the temp filename.
        var addNamedRequest = sdcard.addNamed(blob, ADDON_FILENAME);

        addNamedRequest.onsuccess = function() {
          // Retrieve the new tempfile.
          var getRequest = sdcard.get(ADDON_FILENAME);

          getRequest.onsuccess = function () {
            var addonFile = getRequest.result;
            // Import the addon using the tempfile.
            navigator.mozApps.mgmt.import(addonFile).then(function (addon) {
              // Enable the addon by default.
              enableAddon(addon);
              resolve(addon);
            }).catch(reject);
          };
          getRequest.onerror = function (error) { reject(error); };
        };
        addNamedRequest.onerror = function(error) { reject(error); };
      };
    });
  }