fixed a missing syntax error (missing closing bracket); no extra changelog addition since it's not yet accepted afaik

- Mozilla Firefox 67.0
  * Firefox 67 will be able to run different Firefox installs side by side
    https://blog.nightly.mozilla.org/2019/01/14/moving-to-a-profile-per-install-architecture/
  * Tabs can now be pinned from the Page Actions menu in the address bar
  * Users can block known cryptominers and fingerprinters in the
    Custom settings or their Content Blocking preferences
  * The Import Data from Another Browser feature is now also available
    from the File menu
  * Firefox will now protect you against running older versions which
    can lead to data corruption and stability issues
  * Easier access to your list of saved logins from the main menu and
    login autocomplete
  * We’ve added a toolbar menu for your Firefox Account to provide more
    transparency for when you are synced, sharing data across devices
    and with Firefox. Personalize the appearance of the menu with your
    own avatar
  * Enable FIDO U2F API, and permit registrations for Google Accounts
  * Enabled AV1 support on Linux
  MFSA 2019-13 (boo#1135824)
  * CVE-2019-9815 (bmo#1546544)
    Disable hyperthreading on content JavaScript threads on macOS
  * CVE-2019-9816 (bmo#1536768)
    Type confusion with object groups and UnboxedObjects
  * CVE-2019-9817 (bmo#1540221)
    Stealing of cross-domain images using canvas
  * CVE-2019-9818 (bmo#1542581) (Windows only)
    Use-after-free in crash generation server
  * CVE-2019-9819 (bmo#1532553)
    Compartment mismatch with fetch API
  * CVE-2019-9820 (bmo#1536405)

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