This bug was fixed in the package mutter - 45.2-3ubuntu1

---------------
mutter (45.2-3ubuntu1) noble; urgency=medium

  * Merge with Debian. Remaining changes:
    - Add x11-Add-support-for-fractional-scaling-using-Randr.patch
    - Add window-Add-ability-to-override-the-edge-constraints.patch
      + Make possible for extensions (such as Tiling Assistant) to override
        window constraints

mutter (45.2-3) experimental; urgency=medium

  [ Daniel van Vugt ]
  * Update Support-Dynamic-triple-double-buffering.patch
    with a fix to the frame clock for a regression inherited from
    45.1 (8f27ebf8) whereby it would enter triple buffering mode
    prematurely. And because it was premature, the clock would soon
    notice that triple buffering isn't required and drop back to double
    buffering. But the switch from triple to double buffering stalls the
    client frame queue by one frame which for some clients like Firefox
    is seen as a frame skip. (LP: #2046360)

mutter (45.2-2) experimental; urgency=medium

  * Team upload

  [ Chris Hofstaedtler ]
  * Honor udev.pc's udevdir when installing udev rules (Closes: #1057319)

  [ Simon McVittie ]
  * Merge with version 44.7-1 from unstable
  * d/control, d/rules: Stop generating d/control from d/control.in
  * d/patches: Mark several additional tests as flaky.
    Most of these have never been reliable on Debian buildds, especially
    on ARM, so having them fail is not a regression. They usually succeed
    after a few retries, but that's time-consuming and unsuitable to be a
    QA gate.
    The restore-size test was previously not run at all: now it is run, but
    marked as flaky (so its result is ignored).

 -- Jeremy Bícha <jbi...@ubuntu.com>  Wed, 20 Dec 2023 09:32:48 -0500

** Changed in: mutter (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/2046360

Title:
  Heavy stuttering in Firefox with mutter 45.1/45.2

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