LD_PRELOAD was always necessary to make the cam work.
Yes, with 5.15.2 it worked (only) with LD_PRELOAD, with 5.15.3 even LD_PRELOAD 
doesn't help anymore (so currently I don't know any way how to make the cam be 
detected by Falkon).

Did a test with latest Google Chrome, seems to be the same as with
Falkon (cam is not detected even when using LD_PRELOAD). I never used
Google Chrome, so I unfortunately can't tell if it used to work on older
Chrome versions.

With Chromium I can't test because it's only avaiable as a Snap or
Flatpak where the LD_PRELOAD trick doesn't seem to be possible ( --> no
way to use the cam in a snapped or flatpaked app).

On Firefox the cam still works when launching with LD_PRELOAD.

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https://bugs.launchpad.net/bugs/1923434

Title:
  Regression: Falkon doesn't detect webcam anymore since 5.15.3+dfsg-
  3ubuntu1

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