- Mozilla Thunderbird 91.4.0
  * several fixes as outlined here
    https://www.thunderbird.net/en-US/thunderbird/91.4.0/releasenotes
  MFSA 2021-54 (bsc#1193485)
  * CVE-2021-43536 (bmo#1730120)
    URL leakage when navigating while executing asynchronous
    function
  * CVE-2021-43537 (bmo#1738237)
    Heap buffer overflow when using structured clone
  * CVE-2021-43538 (bmo#1739091)
    Missing fullscreen and pointer lock notification when
    requesting both
  * CVE-2021-43539 (bmo#1739683)
    GC rooting failure when calling wasm instance methods
  * CVE-2021-43541 (bmo#1696685)
    External protocol handler parameters were unescaped
  * CVE-2021-43542 (bmo#1723281)
    XMLHttpRequest error codes could have leaked the existence of
    an external protocol handler
  * CVE-2021-43543 (bmo#1738418)
    Bypass of CSP sandbox directive when embedding
  * CVE-2021-43545 (bmo#1720926)
    Denial of Service when using the Location API in a loop
  * CVE-2021-43546 (bmo#1737751)
    Cursor spoofing could overlay user interface when native
    cursor is zoomed
  * CVE-2021-43528 (bmo#1742579)
    JavaScript unexpectedly enabled for the composition area
  * MOZ-2021-0009 (bmo#1393362, bmo#1736046, bmo#1736751,
    bmo#1737009, bmo#1739372, bmo#1739421)

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