[Bug 1731767] [NEW] Plasma 5.11.3 breaks firefox

[Sergio Callegari]

Public bug reported:

After the delivery of plasma 5.11.3 via the kubuntu backports ppa (ppa
:kubuntu-ppa/backports), firefox is completely unusable.

Seen on two different machines, one with intel graphics (haswell) and
one with nvidia quadro FX570 using the nouveau driver.

Firefox cannot be used unless compositing is turned off in kwin, so I
suspect an issue in the latter. Specifically, all firefox buttons that
are expected to open a window (e.g., the main menu button, the bookmark
button, most of the extensions button) do not, making the browser
limited to mere browsing (no bookmarks, no advanced actions driven via
the menu, no extensions).

The two machines where I see the issue have in common the use of mesa as
the opengl provider (latest mesa in fact). I do not have the option to
try with proprietary graphics drivers.

Please, provide a way to go back to 5.11.2 without removing the KDE
backports altogether.

** Affects: kubuntu-ppa
     Importance: Undecided
         Status: New

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Title:
  Plasma 5.11.3 breaks firefox

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