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Firefox 23.0.1 lags. YouTube plays with lag. Only happens with Firefox browser. Any solution? Ability to download from YouTube only reason keeping FFox.

  • 11 replies
  • 93 have this problem
  • 22 views
  • Last reply by Doug

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Videos from the internet play with lag. Pages scroll with lag. Pointer lags only on browser. There are no pending downloads in my computer. Saw a similar problem but it is not applicable to this issue. I have deleted cookies and other stuff and the problem persists. Already using Chrome but Fire Fox ability to download YouTube videos is only reason I still keep it. Loyal to Fire Fox for many years but this is becoming a mayor issue.

Videos from the internet play with lag. Pages scroll with lag. Pointer lags only on browser. There are no pending downloads in my computer. Saw a similar problem but it is not applicable to this issue. I have deleted cookies and other stuff and the problem persists. Already using Chrome but Fire Fox ability to download YouTube videos is only reason I still keep it. Loyal to Fire Fox for many years but this is becoming a mayor issue.

All Replies (11)

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In order to be able to find the correct solution to your problem, we require some more non-personal information from you. Please do the following:

  • Click the Firefox button at the top left, then click the Help menu and select Troubleshooting Information from the submenu. If you don't have a Firefox button, click the Help menu at the top and select Troubleshooting Information from the menu.

Now, a new tab containing your troubleshooting information should open.

  • At the top of the page, you should see a button that says "Copy text to clipboard". Click it.
  • Now, go back to your forum post and click inside the reply box. Press Ctrl+V to paste all the information you copied into the forum post.

If you need further information about the Troubleshooting information page, please read the article Use the Troubleshooting Information page to help fix Firefox issues.

Thanks in advance for your help!

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Also attempt to troubleshoot Flash's protected mode and all other methods of troubleshooting told on the link below.

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Thanks, here you go.

 Application Basics
       Name
       Firefox
       Version
       23.0.1
       User Agent
       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0
       Build Configuration
         about:buildconfig
 Extensions
       Name
       Version
       Enabled
       ID
       Download YouTube Videos as MP4
       1.7.8
       true
       {b9bfaf1c-a63f-47cd-8b9a-29526ced9060}
       Pocket
       3.0.4
       true
       isreaditlater@ideashower.com
       ScrapBook
       1.5.6
       true
       {53A03D43-5363-4669-8190-99061B2DEBA5}
       Skype Click to Call
       6.11.0.13348
       true
       {82AF8DCA-6DE9-405D-BD5E-43525BDAD38A}
       StumbleUpon
       4.16
       true
       {AE93811A-5C9A-4d34-8462-F7B864FC4696}
       Xmarks
       4.2.3
       true
       foxmarks@kei.com
       Freemake Video Converter Plugin
       1.0.0
       false
       fmconverter@gmail.com
 Important Modified Preferences
     Name
     Value
       accessibility.typeaheadfind.flashBar
       0
       browser.cache.disk.capacity
       358400
       browser.cache.disk.smart_size.first_run
       false
       browser.cache.disk.smart_size.use_old_max
       false
       browser.cache.disk.smart_size_cached_value
       358400
       browser.places.smartBookmarksVersion
       4
       browser.startup.homepage
       https://www.google.com.mx/webhp?hl=en&tab=ww
       browser.startup.homepage_override.buildID
       20130814063812
       browser.startup.homepage_override.mstone
       23.0.1
       browser.tabs.warnOnClose
       false
       dom.mozApps.used
       true
       dom.w3c_touch_events.expose
       false
       extensions.lastAppVersion
       23.0.1
       gfx.direct3d.last_used_feature_level_idx
       0
       gfx.direct3d.prefer_10_1
       true
       network.cookie.prefsMigrated
       true
       places.database.lastMaintenance
       1377827154
       places.history.expiration.transient_current_max_pages
       104858
       plugin.disable_full_page_plugin_for_types
       application/pdf
       plugin.importedState
       true
       plugin.state.java
       0
       plugin.state.npdeployjava
       0
       privacy.cpd.downloads
       false
       privacy.cpd.history
       false
       privacy.donottrackheader.enabled
       true
       privacy.popups.showBrowserMessage
       false
       privacy.sanitize.migrateFx3Prefs
       true
       privacy.sanitize.timeSpan
       0
       security.warn_viewing_mixed
       false
       storage.vacuum.last.index
       1
       storage.vacuum.last.places.sqlite
       1377145732
 Graphics
       Adapter Description
       Intel(R) HD Graphics Family
       Adapter Drivers
       igdumd64 igd10umd64 igd10umd64 igdumdx32 igd10umd32 igd10umd32
       Adapter RAM
       Unknown
       Device ID
       0x0116
       Direct2D Enabled
       true
       DirectWrite Enabled
       true (6.2.9200.16571)
       Driver Date
       12-16-2010
       Driver Version
       8.15.10.2266
       GPU #2 Active
       false
       GPU Accelerated Windows
       1/1 Direct3D 10
       Vendor ID
       0x8086
       WebGL Renderer
       Google Inc. -- ANGLE (Intel(R) HD Graphics Family)
       AzureCanvasBackend
       direct2d
       AzureContentBackend
       direct2d
       AzureFallbackCanvasBackend
       cairo
 JavaScript
       Incremental GC
       true
 Accessibility
       Activated
       false
       Prevent Accessibility
       0
 Library Versions
       Expected minimum version
       Version in use
       NSPR
       4.10
       4.10
       NSS
       3.15 Basic ECC
       3.15 Basic ECC
       NSSSMIME
       3.15 Basic ECC
       3.15 Basic ECC
       NSSSSL
       3.15 Basic ECC
       3.15 Basic ECC
       NSSUTIL
       3.15
       3.15
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Attempt Firefox safe mode and see if it occurs there...

Also try the flash troubleshooting as I said in my last post.

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Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.

You can try these free programs to scan for malware, which work with your existing antivirus software:

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.


Further information can be found in the Troubleshoot Firefox issues caused by malware article.


NOTE: Install the SUMO Troubleshooter. This add-on will add your troubleshooting information that you posted above to all future questions.

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I've got this exact same issue.

I've tried disabling Hardware Acceleration in both Firefox and Flash, I've booted up with Safety Mode enabled and themes disabled; videos will stop playing and will only play when I'm scrolling my mouse." It doesn't happen in Safari.

Running Firefox 23.01 Mac OSX 10.8.4 Flash 11.8. r800

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I had this problem previously and tried everything with Flash and Firefox. Except it took me way longer than it should have to try the most obvious thing, which fixed it:

Update your graphics/video card drivers.

This may or may not be your problem, but it's worth it to try.

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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.

  1. Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
  2. After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
  3. 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 Install Firefox on Linux. If you downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory.
  4. Now, go ahead and reinstall Firefox:
    1. Double-click the downloaded installation file and go through the steps of the installation wizard.
    2. Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.

Please report back soon.

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I'd actually already tried reinstalling earlier, and used CCleaner to make sure I got every last bit. Aside from re-syncing with my Firefox account after installation, it was a fresh start. Still didn't fix the issue.

Also, in regards to updating my graphics card, I guess Macs auto-update your graphics cards with every software update. So I upgraded to 10.8.5, but I've still got the issue. Plus I'm not sure if that was the issue anyway; I know this is probably a naive statement, but if it was graphics card related, why would videos load fine in Safari but not in Firefox?

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Review YouTube's permissions on this Firefox browser.

This can be done by clicking on the Earth/lock icon at the left side of the address bar.

Also, please try the following:

  1. Go to the Firefox options
  2. Select the Advanced tab
  3. Select the Network tab
  4. Click the Configure How Firefox Connects To The Internet button
  5. Select Use System Proxy Settings
  6. If this doesn't fix the issue, select Detect Proxy Settings For This Network

Please report back soon.

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As far as Permissions are concerned, I allow Youtube to Load Images, Set Cookies, Maintain Offline Storage, Enter Fullscreen, and Hide My Mouse Pointer. I block it from everything else.

As far as proxy settings are concerned, it matches my System's proxy settings. Neither "Auto-Detect" nor "Use My System's Proxy Settings" resoles the issue.