Fix memory leak and unneeded open processes. These are not features, they are defects.
My Firefox uses up to 60% of the CPU on my laptop. How to reduce it, how to fix it?
Is this a bug or config problem? Occasionally, FF (Linux desktop) starts using a lot of memory. I kill tabs (sometimes it is OK to kill YouTube or X, sometimes not) Eve… (funda kabanzi)
Is this a bug or config problem?
Occasionally, FF (Linux desktop) starts using a lot of memory. I kill tabs (sometimes it is OK to kill YouTube or X, sometimes not)
Eventually it starts impacting the system using so much memory. I terminate the FF instance. Often. More often than not. There is a separate task still running and I get the "Firefox is still running" when I try to restart. I then kill the remaining FF task via the OS or the process monitor. Then FF restarts.
Is this an issue with addons (I am running very few - uBlock Orign, and Privacy Badger and Cookie AutoDelete. Are the only ones active most of the time) Or is it an actual bug with garbage collection, and tasks getting away? Or is it an OS issue?
I'm finding that firefoxcp isolated web content uses a LOT of memory on my Mac Mini. What can I do about this besides not using Firefox. I like the browser and have been … (funda kabanzi)
I'm finding that firefoxcp isolated web content uses a LOT of memory on my Mac Mini. What can I do about this besides not using Firefox. I like the browser and have been using it since its introduction
There is a similar (but not identical) topic on Mozilla Connect , and I posted there. But I did not get a response. So I am re-posting on this new topic on Mozilla Supp… (funda kabanzi)
There is a similar (but not identical) topic on Mozilla Connect , and I posted there. But I did not get a response. So I am re-posting on this new topic on Mozilla Support. I have a similar problem to what was discussed on Connect. I am using Firefox 133.0.3 on Windows 10 Professional. After Firefox has been running for a while, I get a message from Windows 10 that the free space on my C:drive is low. I did a directory listing on my C-drive before and after Exiting Firefox; I saw no large files disappearing. Then I decided to do "dir c:\ /ah" to see hidden files. What I saw was that pagefile.sys decreased in size from 29,925,748,736 to 16,270,770,176. This was a decrease of 13.7 Gb. Is this normal? I have lots of windows and tabs open in Firefox. Thanks.
When I open one tab on Firefox, my task manager shows multiple programs running along side it. I know some extra processes are needed but this seems like an unusual amoun… (funda kabanzi)
When I open one tab on Firefox, my task manager shows multiple programs running along side it. I know some extra processes are needed but this seems like an unusual amount. I have included a screenshot of the tasks that appear. When I try to delete these, they reappear. I have tried various online solutions such as uninstalling and reinstalling, and checking various settings. It is affecting my computer's performance and I am not sure how to solve this. Thank you!
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 woul… (funda kabanzi)
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.
Firefox prompted me that my local storage space was insufficient. When I opened the data management page, I found that a particular website's local storage was abnormally… (funda kabanzi)
Firefox prompted me that my local storage space was insufficient. When I opened the data management page, I found that a particular website's local storage was abnormally large, and some websites were inaccessible or unable to log in. After restarting Firefox, the issue did not reoccur.
Firefox is creating very high CPU use with many WebThumbnailExtension Web Connect processes. The processes disappear after shutting down Firefox and other programs that a… (funda kabanzi)
Firefox is creating very high CPU use with many WebThumbnailExtension Web Connect processes. The processes disappear after shutting down Firefox and other programs that access the internet. Does anyone have an answer on how to prevent this from happening?
MacBook Pro M4 with MacOS Sequoia 15.3.1
When opening Firefox, Duplicates open but are unseen. I may have 2 tabs open but my task manager tells me there are 14, sometimes 31. What can I do to stop or get rid of … (funda kabanzi)
When opening Firefox, Duplicates open but are unseen. I may have 2 tabs open but my task manager tells me there are 14, sometimes 31. What can I do to stop or get rid of the duplicates pages. if I can't I will have to remove Firefox.
By offering thoughts on this dramatic increase in RAM usage.
Signature <unknown in nvwgf2umx.dll> | NDXGI::CDevice::FlushAndEnqueueSetEvent More Reports Search UUID d9593aae-27fc-42b4-ac33-c4df80250512 Date Processed 2025-… (funda kabanzi)
Signature <unknown in nvwgf2umx.dll> | NDXGI::CDevice::FlushAndEnqueueSetEvent More Reports Search UUID d9593aae-27fc-42b4-ac33-c4df80250512 Date Processed 2025-05-12 00:33:56 UTC Uptime 603 seconds (10 minutes and 3 seconds) Install Age 169,246 seconds since version was first installed (1 day, 23 hours and 46 seconds) Install Time 2025-05-09 13:27:28 Product Firefox Release Channel release Version 138.0.1 Build ID 20250430203103 (2025-04-30) Buildhub data OS Windows 10 OS Version 10.0.19045 Windows Error Reporting
True
Build Architecture amd64 CPU Info family 6 model 23 stepping 6 CPU Count 2 Adapter Vendor ID
NVIDIA Corporation (0x10de)
Adapter Device ID
GT218 [GeForce 210] (0x0a65)
Startup Crash
False
Process Type gpu Crash Reason EXCEPTION_STACK_BUFFER_OVERRUN / FAST_FAIL_STACK_COOKIE_CHECK_FAILURE Crash Address 0x00007ffe333bfbf0 Total Virtual Memory 140,737,488,224,256 bytes (140.74 TB) Available Virtual Memory 138,531,054,325,760 bytes (138.53 TB) Available Page File 1,231,540,224 bytes (1.23 GB) Available Physical Memory 747,290,624 bytes (747.29 MB) System Memory Use Percentage 76 EMCheckCompatibility
True
App Notes
FP(D10-L1000-W0000100-T01) DWrite? DWrite+ WR? WR+The Crash report shows thus and my pc lost power suddenly and could not continue browsing .
Firefox consuming too much Memory, ranging from 1800 MB up to 2000 MB, causing my other programs (most notably Corel WordPerfect) to constantly crash. How do we resolve t… (funda kabanzi)
Firefox consuming too much Memory, ranging from 1800 MB up to 2000 MB, causing my other programs (most notably Corel WordPerfect) to constantly crash. How do we resolve this?
Hi, there are massive performance issues while playing videos on Youtube while using Firefox. This does not happen with the same video while using edge. The attached vid… (funda kabanzi)
Hi,
there are massive performance issues while playing videos on Youtube while using Firefox. This does not happen with the same video while using edge. The attached video shows the used memory and CPU of the youtube tab from the firefox process manager. This was taken after playing the video for 30s. Letting it run longer resulted in firefox taking up 20GB of RAM.
I think this happens since I installed 138.0 of firefox.
Could you please take a look.
Thanks.
Best regards
Firefox uses too much memory, with 1 tab 1GB+, and with 4 tabs all 3GB+, this is not normal, the forum topic did not help, reinstalled and did not help, there are no more… (funda kabanzi)
Firefox uses too much memory, with 1 tab 1GB+, and with 4 tabs all 3GB+, this is not normal, the forum topic did not help, reinstalled and did not help, there are no more than 6 extensions, and they consume only 160mb.
One page of Firefox 115.21 opened and Task manager memory usage for Firefox reports-: 1) 9,956 K 2) 46,288 K 3) 11,564 K 4) 55,268 K 5) 21,560 K 6… (funda kabanzi)
One page of Firefox 115.21 opened and Task manager memory usage for Firefox reports-:
1) 9,956 K 2) 46,288 K 3) 11,564 K 4) 55,268 K 5) 21,560 K 6) 9,996 K 7) 5,516 K 8) 302,924 K 9) 40,272 K
These are ALL marked Firefox and in order on my Task Manager, the Page 'opened' was Firefox help forum ,,,, some memory usage here, is this right????
Dave
Firefox is running too many processes in the background. You have eliminated access to the user settings to be able to reduce that number. It is using so much memory (two… (funda kabanzi)
Firefox is running too many processes in the background. You have eliminated access to the user settings to be able to reduce that number. It is using so much memory (two tabs, one window, 1400 MB) it is becoming a nuisance rather than an asset. How do I reduce the number of processes. Thanks
firefox 138.0.1 is eating up memory, specifically; -contentproc -isforbrowser -prefshandle theres over 20 of them requiring 200mb each please tell me how to turn this … (funda kabanzi)
firefox 138.0.1 is eating up memory, specifically;
-contentproc -isforbrowser -prefshandle
theres over 20 of them requiring 200mb each
please tell me how to turn this off
thx
Even with all media tabs closed, GPU process keeps hogging memory. Tried with extensions disabled, but no effect. The main culprit is this GPU process. screenshot attache… (funda kabanzi)
Even with all media tabs closed, GPU process keeps hogging memory. Tried with extensions disabled, but no effect. The main culprit is this GPU process. screenshot attached.