Tap here to go to the mobile version of the site.
Your Firefox is out of date and may contain a security risk! Upgrade Firefox

Support Forum

Firefox does not play any Flash even with the latest Flash installed



My firefox cannot play any Flash for months.

Here are the issues: 1. If i want to watch videos on Youtube, it just turns out black (clicking on the video can trigger the pause icon though). 2. If i want to watch some website with Flash, it just loads the first 2 secs and then the Flash freezes.

I have read all the help information in the forum and tried many solutions (see below) but none of them worked:

- Uninstall and reinstall Firefox - Uninstall and reinstall Flash:

      1) when entered Youtube without Flash installed, the website asked me to install Flash but it somehow ended to a failure so I had to manually download and install
      2) after installing Flash, I also went to: http://www.adobe.com/software/flash/about/. I can see the version info but not the animation of the banner - it just shows a red box and then disappears after a few secs.

- Reset Firefox - Use the browser safe mode - Install the latest Realplayer - Scan the plugin status on the website: http://www.mozilla.org/en-US/plugincheck/ - Turn off the hardware acceleration in the Advanced option - Regenerate the "pluginreg.dat" file

I am using WIn 7 (64 bits), with Firefox 24.0 and Flash11_8_800_168. I have spent too much time on this issue and now I am using Chrome to watch the video.

Hope this can be solved with your help.

Thanks! -Jeffery

Chosen solution

Hi Jeffery, I am not familiar with many of your plugins. In case one of them could be affecting Flash content, could you disable any that you do not use on a regular basis? (Set to "Never Activate")

orange Firefox button (or Tools menu) > Add-ons > Plugins category

Read this answer in context 6

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.8 r800
  • Next Generation Java Plug-in 10.40.2 for Mozilla browsers
  • Adobe PDF Plug-In For Firefox and Netscape 11.0.04
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • npalidcp
  • Alipay Security Control
  • Google Update
  • GEPlugin
  • 5.1.20513.0
  • npaliedit
  • QQ QuickLogin Helper
  • iTunes Detector Plug-in
  • Picasa plugin
  • QQ2013 Firefox Plugin
  • QQ2013 Chrome Plugin for Chrome V23.0.1271.64 or latest version
  • NVIDIA 3D Vision plugin for Mozilla browsers
  • NVIDIA 3D Vision Streaming plugin for Mozilla browsers
  • Unity Player 4.0.1f2
  • A plugin to detect whether the Adobe Application Manager is installed on this machine.
  • npwangwang
  • npAliSSOLogin Plugin
  • QQMusic
  • China Merchants Bank Edit
  • npalicdo
  • The plug-in allows you to open and edit files using Microsoft Office applications
  • Office Authorization plug-in for NPAPI browsers


  • Firefox 24.0
  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0
  • Support URL: https://support.mozilla.org/1/firefox/24.0/WINNT/en-US/


  • Adobe Acrobat - Create PDF 2.0 (web2pdfextension@web2pdf.adobedotcom)
  • Firebug 1.12.1 (firebug@software.joehewitt.com)
  • FireGestures 1.7.12 (firegestures@xuldev.org)
  • Troubleshooter 1.1a (troubleshooter@mozilla.org)
  • Youdao Word Capturer 1.81 (dict@www.youdao.com)


  • incrementalGCEnabled: True


  • adapterDescription: NVIDIA GeForce GTX 460
  • adapterDescription2:
  • adapterDeviceID: 0x0e22
  • adapterDeviceID2:
  • adapterDrivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
  • adapterDrivers2:
  • adapterRAM: 1023
  • adapterRAM2:
  • adapterVendorID: 0x10de
  • adapterVendorID2:
  • direct2DEnabled: False
  • direct2DEnabledMessage: [u'']
  • directWriteEnabled: False
  • directWriteVersion: 6.1.7600.16972
  • driverDate: 2-9-2013
  • driverDate2:
  • driverVersion:
  • driverVersion2:
  • info: {u'AzureCanvasBackend': u'skia', u'AzureFallbackCanvasBackend': u'cairo', u'AzureContentBackend': u'none'}
  • isGPU2Active: False
  • numAcceleratedWindows: 0
  • numAcceleratedWindowsMessage: [u'']
  • numTotalWindows: 1
  • webglRenderer: Google Inc. -- ANGLE (NVIDIA GeForce GTX 460 Direct3D9Ex vs_3_0 ps_3_0)
  • windowLayerManagerRemote: False
  • windowLayerManagerType: Basic

Modified Preferences

  • 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_override.buildID: 20130910160258
  • browser.startup.homepage_override.mstone: 24.0
  • dom.mozApps.used: True
  • extensions.lastAppVersion: 24.0
  • gfx.direct2d.disabled: True
  • gfx.direct3d.last_used_feature_level_idx: 0
  • layers.acceleration.disabled: True
  • network.cookie.prefsMigrated: True
  • places.database.lastMaintenance: 1379926019
  • places.history.expiration.transient_current_max_pages: 104858
  • plugin.disable_full_page_plugin_for_types: application/pdf
  • plugin.importedState: True
  • plugin.state.flash: 2
  • plugin.state.npdeployjava: 0
  • plugin.state.npmmrwebplugin: 0
  • privacy.cpd.downloads: False
  • privacy.cpd.formdata: False
  • privacy.cpd.history: False
  • privacy.cpd.sessions: False
  • privacy.sanitize.migrateFx3Prefs: True
  • privacy.sanitize.timeSpan: 0


  • User JS: No
  • Accessibility: Yes
HTML5Shark 0 solutions 5 answers

Helpful Reply

What hardware are you on? Flash is always a finicky beast, especially on older hardware. This is not an entirely uncommon problem. Try looking at this support article and see if that helps.

  • Top 10 Contributor
2365 solutions 20925 answers

Hi Jeffery, it sounds as though you're halfway through my list of standard approaches to Flash problems.

(1) If you use any recorders/downloaders that interact with Flash media (either external software or Firefox add-ons), make sure they are as up-to-date as possible, or disable them temporarily.

(2) Disable hardware graphics acceleration in Firefox and in Flash

(A) In Firefox -- un-check the box here and restart:

orange Firefox button (or Tools menu) > Options > Advanced > General > "Use hardware acceleration when available"

(B) In Flash -- see this support article from Adobe: http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues

(3) Disable protected mode (Windows Vista/7/8)

See this support article from Adobe under the heading "Last Resort": Adobe Forums: How do I troubleshoot Flash Player's protected mode for Firefox?

Question owner

Thank you for the suggestions. I have tried all of them but still not working :(

By the way, the Flash menu always appears in the right bottom when I tried to open it (see attached picture).

I cannot either enter the setting in Flash. I can right click to trigger the Flash menu but after clicking "Setting" it does nothing. The "Global Setting" can be opened somehow.

Question owner

I doubt but here are the specs:

CPU: Intel(R) Xeon(R) W3550 @3.07GHz Graphic Card: NIVIDIA GeForce GTX 460 (with the up-to-date driver) RAM: 8.00 GB

  • Top 10 Contributor
  • Moderator
10759 solutions 96838 answers

Did you disable hardware acceleration in Firefox and in the Flash plugin (you need to close and restart Firefox)?

  • Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"

Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to see if that helps.

  • Top 10 Contributor
2365 solutions 20925 answers

Chosen Solution

Hi Jeffery, I am not familiar with many of your plugins. In case one of them could be affecting Flash content, could you disable any that you do not use on a regular basis? (Set to "Never Activate")

orange Firefox button (or Tools menu) > Add-ons > Plugins category

Question owner

Hi, I disabled a few plugins and it did work! Now I can play all the Flash!

The wired part is when I activated all the plugins, Firefox can still play Flash, so I don't know which one caused the problem.

Anyways, I appreciate your help. I can finally use Firefox after months.