- Mozilla Firefox 66.0
  * Increased content processes to 8
  * Added capability to search through open tabs from the tab overflow menu
  * New backend for the storage.local WebExtensions API, providing
    I/O performance improvements when the extension updates a small
    subset of the stored data
  * WebExtension keyboard shortcuts can now be managed or overridden
    from about:addons
  * Improved scrolling behavior: Firefox will now attempt to keep content
    from jumping around while a page is loading by supporting scroll
    anchoring
  * New about:privatebrowsing with search
  * A certificate error page now notifies the user of the name of the
    certificate issuer that breaks HTTPs connections on intercepted
    connections to help troubleshooting possible anti-virus software
    issues.
  * Fixed an performance issue some Linux users experienced with the
    Downloads panel (bmo#1517101)
  * Firefox now blocks all autoplay media with sound by default. Users
    can add individual sites to an exceptions list or turn the blocking
    off.
  * System title bar is hidden by default to match Gnome guideline
  MFSA 2019-07 (bsc#1129821)
  * CVE-2019-9790 (bmo#1525145)
    Use-after-free when removing in-use DOM elements
  * CVE-2019-9791 (bmo#1530958)
    Type inference is incorrect for constructors entered through on-stack
    replacement with IonMonkey
  * CVE-2019-9792 (bmo#1532599)
    IonMonkey leaks JS_OPTIMIZED_OUT magic value to script

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