Komunitné fórum Firefox

For little more than year I've been battling with an issue, where after watching Youtube for hour or two, and having 5-6 open tabs with videos, at some point Firefox would crawl to a stop with UI going down to 1-2 fps, and finally inability to click anything, until I restarted the browser.

Only today I have pieced together, that when it happens, task manager shows almost all of my GPU's VRAM (Dedicated GPU memory) is claimed by Firefox. It looks that there is a GPU memory leak somewhere.

How should I go on about this? If it's a bug, what I should include in a report?

Here is ~2 hrs of progress, PC and Firefox specs at the end:

This is after watching one ~20 minute video:

====================

GPU (pid 10124) Explicit Allocations

0.24 MB (100.0%) -- explicit └──0.24 MB (100.0%) -- gfx/webrender/gpu-cache

  ├──0.24 MB (100.0%) ── metadata
  └──0.00 MB (00.00%) ── cpu-mirror

Other Measurements

0.78 MB (100.0%) -- gfx └──0.78 MB (100.0%) ── webrender/textures/gpu-cache

 265.84 MB ── gpu-committed

1,246.20 MB ── gpu-dedicated

  11.72 MB ── gpu-shared

End of GPU (pid 10124)

====================

After second video, another 15 minutes later:

====================

GPU (pid 10124) Explicit Allocations

0.29 MB (100.0%) -- explicit └──0.29 MB (100.0%) -- gfx/webrender/gpu-cache

  ├──0.29 MB (100.0%) ── metadata
  └──0.00 MB (00.00%) ── cpu-mirror

Other Measurements

0.63 MB (100.0%) -- gfx └──0.63 MB (100.0%) ── webrender/textures/gpu-cache

 277.34 MB ── gpu-committed

1,737.74 MB ── gpu-dedicated

  16.55 MB ── gpu-shared

End of GPU (pid 10124)

====================

After opening and CLOSING several youtube tabs, withplaying 10-15 seconds of each video:

====================

GPU (pid 10124) Explicit Allocations

0.19 MB (100.0%) -- explicit └──0.19 MB (100.0%) -- gfx/webrender/gpu-cache

  ├──0.19 MB (100.0%) ── metadata
  └──0.00 MB (00.00%) ── cpu-mirror

Other Measurements

0.78 MB (100.0%) -- gfx └──0.78 MB (100.0%) ── webrender/textures/gpu-cache

 390.18 MB ── gpu-committed

4,339.20 MB ── gpu-dedicated

   4.27 MB ── gpu-shared

End of GPU (pid 10124)

================================

Here, I closed all tabs except about:memory. After another ~60 minutes of random browsing non-video pages (literally text pages and Google Docs):

====================

GPU (pid 10124) Explicit Allocations

0.25 MB (100.0%) -- explicit └──0.25 MB (100.0%) -- gfx/webrender/gpu-cache

  ├──0.25 MB (100.0%) ── metadata
  └──0.00 MB (00.00%) ── cpu-mirror

Other Measurements

0.94 MB (100.0%) -- gfx └──0.94 MB (100.0%) ── webrender/textures/gpu-cache

 324.99 MB ── gpu-committed

4,396.21 MB ── gpu-dedicated

   0.62 MB ── gpu-shared

End of GPU (pid 10124)

====================

It never goes down.

Then, I opened played for few seconds, stopped and closed (including tabs) ~15 youtube videos:

================================

GPU (pid 10124) Explicit Allocations

52.08 MB (100.0%) -- explicit ├──23.07 MB (44.29%) -- gfx │ ├──23.07 MB (44.29%) -- webrender │ │ ├──10.00 MB (19.20%) ── upload-stagin-memory │ │ ├───6.74 MB (12.95%) ── texture-cache/structures │ │ ├───3.69 MB (07.08%) -- interning │ │ │ ├──1.48 MB (02.84%) -- clip │ │ │ │ ├──0.78 MB (01.50%) ── interners │ │ │ │ └──0.70 MB (01.34%) ── data-stores │ │ │ ├──1.24 MB (02.39%) -- text_run │ │ │ │ ├──0.92 MB (01.77%) ── interners │ │ │ │ └──0.32 MB (00.62%) ── data-stores │ │ │ └──0.96 MB (01.85%) ++ (15 tiny) │ │ ├───0.95 MB (01.83%) ++ (6 tiny) │ │ ├───0.89 MB (01.71%) ── shader-cache │ │ └───0.79 MB (01.52%) -- resource-cache │ │ ├──0.79 MB (01.52%) ── fonts │ │ └──0.00 MB (00.00%) ++ (3 tiny) │ └───0.00 MB (00.00%) ++ (3 tiny) ├──19.94 MB (38.30%) ── heap-unclassified ├───4.00 MB (07.68%) ── ac2d/heap-resources ├───3.25 MB (06.25%) -- threads │ ├──2.29 MB (04.40%) ++ stacks │ └──0.96 MB (01.85%) -- overhead │ ├──0.91 MB (01.76%) ── kernel │ └──0.05 MB (00.09%) ++ (2 tiny) ├───1.35 MB (02.59%) -- phc │ ├──1.35 MB (02.59%) ── metadata │ └──0.00 MB (00.00%) ── fragmentation └───0.46 MB (00.89%) ++ (9 tiny)

Other Measurements

134,217,727.94 MB (100.0%) -- address-space ├──132,114,625.34 MB (98.43%) ── free(segments=370) ├────2,101,793.05 MB (01.57%) -- reserved │ ├──2,097,077.34 MB (01.56%) ── mapped(segments=14) │ └──────4,715.70 MB (00.00%) ── private(segments=550) └────────1,309.55 MB (00.00%) ++ commit

72.73 MB (100.0%) -- decommitted └──72.73 MB (100.0%) -- heap

  ├──61.39 MB (84.41%) ── decommitted
  └──11.34 MB (15.59%) -- unused-pages
     ├──11.34 MB (15.59%) ── fresh
     └───0.00 MB (00.00%) ── madvised

304.62 MB (100.0%) -- gfx └──304.62 MB (100.0%) -- webrender

  ├──302.79 MB (99.40%) -- textures
  │  ├──192.00 MB (63.03%) ── render-targets
  │  ├───44.00 MB (14.44%) -- texture-cache
  │  │   ├──44.00 MB (14.44%) ── atlas
  │  │   └───0.00 MB (00.00%) ── standalone
  │  ├───32.00 MB (10.51%) ── depth-targets
  │  ├───18.93 MB (06.21%) ── swap-chains
  │  ├───11.25 MB (03.69%) ── upload-staging-textures
  │  └────4.61 MB (01.51%) ++ (5 tiny)
  └────1.83 MB (00.60%) ++ images/mapped_from_owner

128.00 MB (100.0%) -- heap ├───72.73 MB (56.82%) -- decommitted │ ├──61.39 MB (47.96%) ── unmapped │ └──11.34 MB (08.86%) -- unused-pages │ ├──11.34 MB (08.86%) ── fresh │ └───0.00 MB (00.00%) ── madvised └───55.27 MB (43.18%) -- committed

   ├──48.27 MB (37.71%) ── allocated
   ├───3.95 MB (03.09%) -- bin-unused
   │   ├──2.35 MB (01.84%) ++ (44 tiny)
   │   └──1.60 MB (01.25%) ── bin-1024
   ├───1.96 MB (01.53%) ── bookkeeping
   └───1.09 MB (00.85%) ── unused-pages/dirty

41 (100.0%) -- ipc-channels ├───7 (17.07%) ── PCompositorManagerParent ├───7 (17.07%) ── PImageBridgeParent ├───7 (17.07%) ── PVRManagerParent ├───6 (14.63%) ── PRemoteDecoderManagerParent ├───5 (12.20%) ── PAPZInputBridgeParent ├───4 (09.76%) ── PCanvasManagerParent ├───2 (04.88%) ── PVideoBridgeParent ├───1 (02.44%) ── PGPUParent ├───1 (02.44%) ── PProfilerChild └───1 (02.44%) ── PVsyncBridgeParent

78 (100.0%) -- ipc-channels-peak ├──14 (17.95%) ── PCompositorManagerParent ├──14 (17.95%) ── PImageBridgeParent ├──14 (17.95%) ── PVRManagerParent ├──13 (16.67%) ── PRemoteDecoderManagerParent ├──10 (12.82%) ── PCanvasManagerParent ├───8 (10.26%) ── PAPZInputBridgeParent ├───2 (02.56%) ── PVideoBridgeParent ├───1 (01.28%) ── PGPUParent ├───1 (01.28%) ── PProfilerChild └───1 (01.28%) ── PVsyncBridgeParent

25 (100.0%) -- observer-service └──25 (100.0%) -- referent

  ├──22 (88.00%) ── strong
  └───3 (12.00%) -- weak
      ├──3 (12.00%) ── alive
      └──0 (00.00%) ── dead

1 (100.0%) -- preference-service └──1 (100.0%) -- referent

  ├──1 (100.0%) ── strong
  └──0 (00.00%) ++ weak

               1 ── ac2d-context-count
               0 ── ac2d-target-count
         4.00 MB ── ac2d-texture-memory
         0.00 MB ── gfx-d2d-vram-draw-target
         0.00 MB ── gfx-d2d-vram-source-surface
       462.87 MB ── gpu-committed
     6,829.63 MB ── gpu-dedicated
         0.62 MB ── gpu-shared
        48.27 MB ── heap-allocated
         1.00 MB ── heap-chunksize
       686.68 MB ── private
       558.20 MB ── resident
       481.14 MB ── resident-unique
        44.44 MB ── system-heap-allocated
 2,103,102.59 MB ── vsize

129,414,503.44 MB ── vsize-max-contiguous

               0 ── webgl-buffer-count
         0.00 MB ── webgl-buffer-memory
               0 ── webgl-context-count
               0 ── webgl-renderbuffer-count
         0.00 MB ── webgl-renderbuffer-memory
               0 ── webgl-shader-count
               0 ── webgl-texture-count
         0.00 MB ── webgl-texture-memory

End of GPU (pid 10124)

====================

This just continues, when gpu-dedicated hits ~7.8 GB, Firefox becomes unusable, and rest of the system appears a bit sluggish.

I can't say if this is regression, since I haven't been watching YT at all until recently.

Windows 10 Pro 22H2 Firefox Nightly 64 bit EN, 139.0a1 build 20250405211119 Checked in my normal everyday profile and with new clean one. GPU acceleration enabled, all video codecs installed.

Hardware: Core i7 9750H, 32 GB DDR4, GeForce 4060 8 GB. this is NOT a RAM issue, RAM usage never goes above ~19 GB on this PC.

It happens a tad bit slower than before, when I had 1060 6 GB.

I also noticed it on my laptop with integrated Intel GPU, but I don't have it anymore, so can't really check.

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