[Bug 1914147]

[Catalin-sasca-z]

Tried again reproducing this issue (following some leads from Bug
1689032 as well) in order to verify this on Firefox 85.0.2 and on ESR,
but had no luck.

Tried creating dirty profiles (adding addons, cache from websites, etc),
installing and uninstalling the browser, updating it over and over from
84.0.2 to 85.0.1, and we couldn't encounter any freezes. Tests were
performed on macOS 11.2, Ubuntu 20.04 and Windows 10.

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https://bugs.launchpad.net/bugs/1914147

Title:
  [upstream] Firefox 85 hangs at startup

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