On Mon, 1 Apr 2024 21:32:41 +0300 Antti-Pekka Känsälä wrote:
Closing the Gmail tab will not help.

I rarely use gmail web UI. At least in the case of KDE, Firefox releases
file descriptor a few seconds after compose dialog is closed. It seems
even closing the tab is not necessary. It was a file on an internal
drive, but I do not think it matters.

appe@renaissance:~$ lsof | grep -i KINGSTON
x-www-bro 83803                             appe  128r      REG
  8,33      3433       6939 /media/appe/KINGSTON/noname/file4.gpg
x-www-bro 83803 83807 glean.dis             appe  128r      REG
  8,33      3433       6939 /media/appe/KINGSTON/noname/file4.gpg
[...]

From my point of view it is in contradiction with the original complain:

I am worried Gmail in a Firefox tab is able to break out of Firefox
somehow, gaining unauthorized access to 128 files on a mounted USB stick.

Isn't /media/appe/KINGSTON/noname/file4.gpg the file you attached? What are other 127 files?

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