[Bug 1813471]

[Y-benjamin]

This seems to be the only reference to GTK_USE_PORTAL in Mozilla's code.
https://searchfox.org/comm-central/source/mozilla/toolkit/system/gnome/nsGIOService.cpp#35

I'm going to start a regression search, and looking around the Mozilla
code to see if there is something they set that we don't.

Will update at the end of the day.

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https://bugs.launchpad.net/bugs/1813471

Title:
  Thunderbird crashes with GTK_USE_PORTAL environment variable.

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