superseding the 91.0 version as another security and hotfix release

- Mozilla Firefox 91.0.1
  * Fixed an issue causing buttons on the tab bar to be resized when
    loading certain websites (bmo#1704404)
  * Fixed an issue which caused tabs from private windows to be
    visible in non-private windows when viewing switch-to-tab results
    in the address bar panel (bmo#1720369)
  * Various stability fixes
  MFSA 2021-37 (bsc#1189547)
  * CVE-2021-29991 (bmo#1724896)
    Header Splitting possible with HTTP/3 Responses

- Mozilla Firefox 91.0
  MFSA 2021-33 (bsc#1188891)
  * CVE-2021-29986 (bmo#1696138)
    Race condition when resolving DNS names could have led to
    memory corruption
  * CVE-2021-29981 (bmo#1707774)
    Live range splitting could have led to conflicting
    assignments in the JIT
  * CVE-2021-29988 (bmo#1717922)
    Memory corruption as a result of incorrect style treatment
  * CVE-2021-29983 (bmo#1719088)
    Firefox for Android could get stuck in fullscreen mode
  * CVE-2021-29984 (bmo#1720031)
    Incorrect instruction reordering during JIT optimization
  * CVE-2021-29980 (bmo#1722204)
    Uninitialized memory in a canvas object could have led to
    memory corruption
  * CVE-2021-29987 (bmo#1716129)
    Users could have been tricked into accepting unwanted

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