Firefox is stuttering

Hi,
My firefox has suddenly started stuttering for some reason. I havent installed or uninstalled any add-ons or software to my computer. I did a full restart of my computer and used the browser in safe mode but it didnt help. In the resource monitor, my CPU usage keeps spiking up and down but I cant seem to find out why. Could you please help me diagnose the problem? I have attached the info below during safe mode.
Thanks!

Try to disable hardware acceleration in Firefox (you need to close and restart Firefox).
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
If it works correctly in Safe Mode and in normal mode with all extensions (Firefox/Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.
Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit)
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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Firefox pauses / stutters frequently after running more than an hour -2

I'm reposting the question that was accidentally marked as solved. Basically FF (since 3.0 version, and now the latest 3.6) stutters after about 1 hour of use.
Previous thread is here: http://support.mozilla.com/en-US/forum/1/533120
== This happened ==
Every time Firefox opened
== since 3.0

This is ridiculous, there's obviously a problem here that needs to be addressed, I've been using FF for over 5 years with no problem but this is so frustrating I'm now looking for a permanent replacement browser. Goodbye Firefox......

Firefox Youtube stuttering

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== URL of affected sites ==
http://
== User Agent ==
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.70 Safari/533.4

This can be a problem with session restore.
Firefox stores session data every 10 seconds to make it possible to restore a crashed session.
If you have (security) software that interferes with that or have many tabs open then that cause cause a delay.
Some have reported that increasing the session store saving interval worked for them.
See http://kb.mozillazine.org/browser.sessionstore.interval

Firefox stuttering randomly

When I'm randomly scrolling through websites or using tab groups, I can see some stuttering. At start up it's really small and passable, but it gets progressively worse until the window randomly turns black and crashes.
I've also noticed that around the time the browser is about to crash, add-ons that are working in the background return a "denied access" entry.
I think it might have something to do with the memory, I usually have 100+ tabs open, but I've the "Don't load tabs until selected" option enabled.
Once Firefox hits over 1-1.5 GB it starts stuttering considerably worse.
I've also gotten a "out of memory" message before which is why I believe it might be a memory issue.
Anyway, memory usage never gets over 80% of my 8 GB of RAM and I've noticed stuttering on just 50% usage.
Any replies are welcome.

Nothing jumping out at me, as a solution, from the crash reports, although most will probably relate to memory issues.
As I mentioned in the last post something worth doing is '''turning on telemetry''' it generates real life data demonstrating Firefox performance
* annonymised aggregated data is available publicly and to Mozilla engineers
* local copies of your own full data is kept in your profile and may be useful evidence of problems
* see [[Send performance data to Mozilla to help improve Firefox]]
If you are interested in getting to the bottom of the issue you are probably going to need to start testing in Firefox's safemode with all plugins disabled and less than 30 open tabs.
Possibly the problem only really happens with many tabs open especially with high graphic content
Quite likely '''stopping memory usage exceeding 1GB''' or whatever will improve things and I can think of three ways to attempt to reign that in and hopefully prevent the stuttering
# Reduce the number of open tabs in use (Maybe use bookmarks more frequently instead of leaving tabs open)
# Use about:memory that not only reports on memory it also has a button to reduce memory use.
# It could be worth checking out this addon it may help,
#* '' Prevent Out Of Virtual Memory Crashes 1.0.3 '' <br /> https://addons.mozilla.org/firefox/addon/prevent-out-of-virtual-memo/
#*but it might be just as easy to manually restart Firefox once stuttering becomes apparent if you no longer get crashes.
For forum cross referencing purposes
* Reports for your Crash IDs
*# bp-82b851f7-c1ad-4f8f-a1e5-fbb7e2140725
*# bp-e727a1b9-9acf-4d9b-90f0-197ff2140724 {Memory 73%)
*# bp-ed9932ed-5507-49da-9d93-57daf2140723 {Memory 73%)
*# bp-5b2fe9f5-f48e-4dd6-a5e3-58ad22140723 {OOM but Memory 66%)
*Crash Signatures:
*# js::RemapWrapper(JSContext*, JSObject*, JSObject*)
*# JSC::Yarr::YarrGenerator<int>::opCompileAlternative(JSC::Yarr::PatternAlternative*)
*# mozilla::layers::PlanarYCbCrImage::GetAsSourceSurface()
*# OOM | large | mozalloc_abort(char const* const) | mozalloc_handle_oom(unsigned int) | moz_xmalloc | gfxAlphaBoxBlur::Init(gfxRect const&, nsIntSize const&, nsIntSize const&, gfxRect const*, gfxRect
*Related bugs {with my comments)
*# Bug 856670 - Firefox crash [@ js::RemapWrapper] <br />{Possibly runnning out of stack no STR)
*# Bug814954 -> Bug 976446 - Replace YARR with irregexp <br />{ ?Out Of Memory. Fx 32 unaffected)
*# no related bugs listed
*# Bug 986502 - Large OOM in gfxAlphaBoxBlur::Init {I added bug comment -- please let me know '''if you notice this signature in Firefox 31''')
Memory issues are not easy to troubleshoot. Stuttering at 50% memory with many addons is going to be impossible to troubleshoot, but '''''5 second+ lags''''' in normal use is unacceptable. However if that is whilst opening and closing masses of tabs each with their own History and many Iframes and images it my be normal and expected behaviour. (Cacheing, or not; & connection speeds; could be other confounding factors )
If the problem exists in safemode and no plugins enabled it can be followed up and if necessary bugs filed. I am not saying always use Firefox like that just that it is necessary for comparison and troubleshooting to test that. On the other hand If the problem is solved in that configuration you should be able to fairly quickly narrow down the cause.
Using multiple profiles may be useful in testing and I can explain that if it helps. There are '''tools''' that may help if you try troubleshooting. I already mentioned ''about:memory''. There is also built a in ''profiler'' that will identify what is happening in 5+ second hangs, or a ''profiler addon'' that will specifically track and log jank where Firefox stops responding.
'''Summary''' I can not guarantee getting to the bottom of your issues but
*I can at least make suggestions for troubleshooting
*Problems caused by Firefox rather than by addons will be investigated,
**and if necessary I am sure the professional HelpDesk staff will be able to lend a hand.
* Using many addons and hundreds of tabs problems are not unexpected
**(I hate to say this but on Windows it may be worth trying a 64 bit browser for comparison.
** However I seem to have noticed; so far unreproducible; issues with High memory usage on recent 64bit Firefox Releases )

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I've tried numerous things to fix it already, this is some of the stuff I can remember trying:
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-Complete reinstall with new profile
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Specs of the new laptop:
Core i7
GTX 970M
16Gb RAM

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This made me think that it could potentially be a plugin, as Tor doesn't have any plugins installed other than Flash. However, after first disabling, then manually removing, every plugin that was listed in about:plugins the problem continues to persist.
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Sound stutters in Firefox flash applications over time

If firefox is left open too long, flash sound stutters (each second of the sound will play about 5+ times before playing the next).
While the problem is happening in Firefox, I can open other browsers to the exact same web page and all is fine.
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This would seem to point to Shockwave Flash being the problem.
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I have been looking for 3 weeks now and have not found a solution. It looks like the same problem happens in Windoz, etc.
Help!

Since Firefox is on 3.6.2 (and I assume that's for Linux as well, but I haven't updated my Ubuntu in a month or so) why use 3.5?
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Often, with 4 or 5 windows open, maybe 20 tabs total, firefox stutters when vertical scrolling pages.

Often, with 4 or 5 windows open, maybe 20 tabs total, firefox stutters when vertical scrolling pages. A restart fixes it.
I can often work all day with many more tabs than 20 open with no issues. So I'm pretty sure the issue is not a lack of system resources.
This last time I've noticed it, it is after waking my Macbook Air from sleep.

Hello,
Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
Please report back to see if this helped you!
Thank you.

Firefox slow down (stuttering) on reaching 1.5GB memory.

I am having problem with Firefox -- as I keep using it (opening more tabs and stuff) it grows in memory usage. I think there might be leaks somewhere, but that is not by itself a problem -- I have plenty of memory.
However I repeatedly observe that upon reaching approximately 1.5GB of memory usage Firefox starts 'micro stuttering' -- scrolling is nowhere as smooth as it is when it just started, text input is not smooth and so on. This is supremely annoying. Firefox restart completely fixes the issue (until the next time), but it is also not a terribly convenient solution (tabs have to reload next time etc.).
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I'd like to provide memory reports (from about:memory) however I need to understand how to anonymize them (they appear to contain lots of URLs some of which I'd rather not share).
Can these reports be used to pinpoint misbehaving addon (if there's one)?
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Ok, I've got annoyed enough by the problem to actually go out of my way and see how it can be reproduced. Turns out -- quite easily.
First of all -- I'm running Windows 7 Home Premium 64 bit with 16Gb of memory with 'classic' desktop (i.e. aero disabled). I'm using Nvidia GTX 760 with desktop extended to two displays (primary 16x10 monitor via DVI and secondary 19x10 TV via HDMI). Scrolling test is performed on the monitor.
Take clean Firefox installation -- specifically I've used FirefoxPortable_29.0.1_English.paf.exe (because I didn't want this experiment to affect anything I'm actually using on my box).
Install two extensions:
- SmoothWheel (AMO) -- this will be used to demonstrate 'stuttering'.
- Flashblock -- this prevents flash stuff from possibly affecting the result.
Configure SmoothWheel (possibly not very relevant, but that's how I can easily see the problem):
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- Speed 0.2 sec
- Advanced -> Adaptive step & duration -- > DISABLED
Open page www.exler.ru (yes, it's in russian, but you don't need to actually read it :)). Try scrolling through the page slowly and quickly. Scrolling with SmoothWheel addon should be very smooth and shouldn't result in excessive CPU usage.
Now without closing that page do the following:
- Open rus.delfi.lv in a new tab. It's again in Russian, but I'm using this because it has a crapload of JS and lots of content.
- Open about 25 more tabs from that page -- I'm basically using middle-click to open 25 pages in background.
- Ensure that each of rus.delfi.lv pages is fully loaded -- to do this in each tab do End-Home-End-Home (yes, you need to use 'End' twice).
- Wait for all pages to finish loading.
At this point Process Explorer shows FireFox memory usage of over 1GB on my machine.
Now go back to www.exler.ru page you have opened and try scrolling it.
In my case scrolling is much less smooth -- and quickly scrolling up and down results in a significantly increased CPU usage (unlike when doing this with only one tab open).
Furthermore now if you start closing open rus.delfi.lv tabs one after another, you'll notice a significant delay (freeze) after each page is closed -- until there are only a few pages remaining.
So yes, it looks like there's something seriously wrong somewhere in the innards -- basically if you have a bunch of tabs open something 'breaks' and causes Firefox to perform poorly when either running JS (because SmoothWheel is a JS extension) or when re-drawing/scrolling page (because that's what we are actually doing).
If you close all the rus.delfi.lv pages -- scrolling should go back to normal. But Firefox memory usage remains quite high in my case -- much higher than it is initially with only one tab open.

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Any streaming video that I view on Firefox stutters, is choppy and very irritating to try and watch. I opened up Internet Explorer and found that I don't have those issues. This occurs on YouTube, Facebook, and all other videos that I attempt to watch.

I've tried both things, but video still stutters.. Have also tried removing profile, and complete reinstall of firefox.
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I've having this stuttering every ~5th second, like a small "1/4 sec buffering".

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Hi WiLD_Cat,
No solution I'm afraid but just to let you know I have exactly the same problem with my MBA core i5 1.7GHz with 8GB RAM which I purchased last week. Some web pages (Facebook is a good example, The Guardian as well) are really unresponsive/choppy while scrolling up/down, while others are ok. I have also noticed that typing text into web forms (such as this one) produces a noticeable lag with text appearing).
Obviously interested if you or anyone else has a solution!

FIREFOX 5 & 6: When viewing videos online, the video stutters every 2-5 seconds like it is buffering.

The videos aren't buffering, though. The videos can be fully buffered or not, it doesn't matter. I've checked IE9 & Google Chrome, and bother browsers view the same videos perfectly. I've disabled my add ons, but nothing works. I love FireFox....I love being able to customize it, but, not only is the video issue a real problem, but FireFox is now really slow. HELP Please!

Hi Koen
Several Time i had this Issue on cust. site you should use a Frequency Optimizer for WIFI
Use a Channel which is not used by your neighbours. There is also Overlapping of Frequencies
Which gives you Performance decrease.
Also a Point was HDMI Cable between AMP/TV and ATV(3,1080p) should be HDMI 1.4. When your TV is New, there is Communication on the wire.
The Last point is your File. 1080p low compressed never works without any losses of something, also with an High-Performance Machine. YouTube, Vimeo... is running because they use High Compression. Data Rates are low for 1080.
In General, there is never a connection which is running over an hour, without any Problems.
Except youre livin in a Forest ;-).
Hope that helps
Greetz Nick.

Scrolling Stutters in FireFox

Just wondering if anyone has issues with scrolling in FireFox. FireFox scrolls smoothly on my 13" and 15" MacBook Pros. On my 11" Air, it's a bit stuttery and really takes away from the "fluid" feel. I have the same settings within FireFox for all three machines. I don't think it should be a CPU related issue as I would imagine the scrolling would be handled by the GPU (although I'm not sure on that) which is more powerful than the GPU in my 2009 13" MB Pro. In terms of power, I don't really do anything taxing on my Air. I just use it for browsing (and I have yet to install flash) and light office type work. I'm just really hoping this isn't a CPU issue as I'll be really disappointed if I can do everything I want without a problem... except smoothly scroll

Joey,
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a

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.local indicates local activity by the computer host Williams-macbook-pro.local=hostname@domain . The UID of 501 is the standard UID of a local computer administrator.
Copy and paste this little script in your terminal:
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echo I am remote
else
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fi
A return of "i am local" ensures there is no remote connection to your machine (through SSH).
In the future, to avoid remote entry, I would recommend not posting your IP address though.

Firefox is stuttering

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