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How to stop autoplay of videos?


June 2013: videos on websites start playing without my permission, how to stop this?

What I tried: I uninstalled Adobe Flash (disabling Flash add-on didn't work), existing "stop autoplay" add-ons are no longer working according to reviews, tried solution described in "How can I stop videos on websites from automatically playing?" (Type in the address bar: about:config Then search for: plugins.click_to_play Double click and it will be set to true) - doesn't stop videos from playing either. Sent feedback to FireFox about the issue.

From what I had read in reviews, this is not only about Flash: YouTube disabled add-ons and searches for anything that can play videos installed in Windows, including using HTML5 for this. Have no information how other websites do it.

How to stop this? Thank you.

Additional System Details

Installed Plug-ins

  • Next Generation Java Plug-in 10.21.2 for Mozilla browsers


  • Firefox 21.0
  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0
  • Support URL: http://support.mozilla.org/1/firefox/21.0/WINNT/en-US/


  • FireFTP 2.0.14 ({a7c6cf7f-112c-4500-a7ea-39801a327e5f})
  • PDF Viewer 0.8.1 (uriloader@pdf.js)
  • Troubleshooter 1.1a (troubleshooter@mozilla.org)


  • incrementalGCEnabled: True


  • adapterDescription: ATI Radeon HD 3400 Series
  • adapterDescription2:
  • adapterDeviceID: 0x95c5
  • adapterDeviceID2:
  • adapterDrivers: aticfx64 aticfx64 aticfx32 aticfx32 atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm64
  • adapterDrivers2:
  • adapterRAM: 256
  • adapterRAM2:
  • adapterVendorID: 0x1002
  • adapterVendorID2:
  • clearTypeParameters: DISPLAY1 [ Gamma: 2200 Pixel Structure: RGB ] DISPLAY4 [ Gamma: 2200 Pixel Structure: BGR ]
  • direct2DEnabled: True
  • directWriteEnabled: True
  • directWriteVersion: 6.2.9200.16492
  • driverDate: 11-16-2012
  • driverDate2:
  • driverVersion: 8.970.100.7000
  • driverVersion2:
  • info: {u'AzureCanvasBackend': u'direct2d', u'AzureFallbackCanvasBackend': u'cairo', u'AzureContentBackend': u'direct2d'}
  • isGPU2Active: False
  • numAcceleratedWindows: 1
  • numTotalWindows: 1
  • webglRenderer: Google Inc. -- ANGLE (ATI Radeon HD 3400 Series)
  • windowLayerManagerType: Direct3D 10

Modified Preferences

  • accessibility.typeaheadfind.flashBar: 0
  • browser.cache.disk.capacity: 1048576
  • browser.cache.disk.smart_size.first_run: False
  • browser.cache.disk.smart_size_cached_value: 1048576
  • browser.places.smartBookmarksVersion: 4
  • browser.search.update: False
  • browser.search.useDBForOrder: True
  • browser.startup.homepage: https://duckduckgo.com/?t=
  • browser.startup.homepage_override.buildID: 20130511120803
  • browser.startup.homepage_override.mstone: 21.0
  • browser.tabs.autoHide: True
  • browser.tabs.loadInBackground: False
  • browser.urlbar.autocomplete.enabled: False
  • dom.disable_window_move_resize: True
  • dom.event.contextmenu.enabled: False
  • dom.mozApps.used: True
  • dom.w3c_touch_events.expose: False
  • extensions.lastAppVersion: 21.0
  • font.internaluseonly.changed: True
  • font.minimum-size.x-western: 20
  • font.size.fixed.x-western: 18
  • font.size.variable.x-western: 18
  • gfx.direct3d.prefer_10_1: True
  • network.cookie.lifetimePolicy: 2
  • network.cookie.prefsMigrated: True
  • places.database.lastMaintenance: 1371052406
  • places.history.enabled: False
  • places.history.expiration.transient_current_max_pages: 104858
  • plugins.click_to_play: True
  • privacy.clearOnShutdown.offlineApps: True
  • privacy.clearOnShutdown.passwords: True
  • privacy.clearOnShutdown.siteSettings: True
  • privacy.cpd.offlineApps: True
  • privacy.cpd.siteSettings: True
  • privacy.donottrackheader.enabled: True
  • privacy.sanitize.migrateFx3Prefs: True
  • privacy.sanitize.sanitizeOnShutdown: True
  • privacy.sanitize.timeSpan: 0
  • security.warn_viewing_mixed: False


  • User JS: No
  • Accessibility: No

Question owner

Thanks for suggestion, but I already completely uninstalled Adobe Flash - there is nothing not block with Flash blocks.

  • Top 10 Contributor
  • Moderator
10754 solutions 96800 answers

Helpful Reply

For HTML5 media you can try to set the media.autoplay.enabled pref to false on the about:config page.

Question owner

Thank you, I did what you advised, still videos continue to load and play automatically. Maybe it's not Flash and not HTML5...

Anything else that I could try?

  • Top 10 Contributor
  • Moderator
10754 solutions 96800 answers

Try to set the Boolean pref media.windows-media-foundation.enabled to false on the about:config page.

Question owner

Thanks again, appreciate it! Did that, videos continue autoload and autoplay. Anything else to try?

Question owner

I'm open to suggestions and appreciate your help. The problem persists on YouTube, but many of other websites' videos are blocked, so there is some progress.

Considering another browser, but there is not much choice between major browsers, that are accepted for transactions and are secure enough. Sorry to end on such sour note.

  • Top 25 Contributor
529 solutions 5045 answers

go to about:config again type in plugins.click_to_play double click it and it should come bold saying True, does it work now.

Question owner

Thank you! Checked, it's in bold and set "true", just as you said. Some videos on YouTube still autoload and autoplay.

What else can I try?

  • Top 25 Contributor
529 solutions 5045 answers

https://addons.mozilla.org/en-US/firefox/addon/flashblock/ - Flashblock addon

Question owner

Sorry, see my 1st and 2nd post here: no Flash at all, there is nothing to block. Updated browser to last version, unusable now, switched to another FireFox based browser, same problem persists.

  • Top 25 Contributor
529 solutions 5045 answers

Chosen Solution


Question owner

Thank you so much! At last it worked, no more forced videos. For videos, when I need them, I can always use another browser.

baybean 1 solutions 3 answers

According to my add-ons manager. Stop YouTube autoplay is not compatible with this system-crippling ff22 update. This has caused multiple additional issues ....

  • Top 25 Contributor
529 solutions 5045 answers

According to my addons-manager it works with firefox 22+

You do understand that you are spamming many email adresses with your rants, you can though ask a new question as jscher said.

Modified by Waka_Flocka_Flame

  • Top 10 Contributor
2365 solutions 20923 answers

Hi baybean, if you are having a lot of issues, please start a new thread and include your configuration details (e.g., OS, plugins, extensions, custom settings), along with a list of the problems. Seeing them all together may help in diagnosing the root cause.

You can start here:


Mesem 0 solutions 1 answers

Helpful Reply

For those of you who do not wish to use StopTube, the click to play plugin in the about:config works. You may just be missing one final step. Once you set the boolean to true, navigate to your firefox addons page and look for shockwave (adobe) flash plugin or whatever you use to play videos. Select the drop down to "ask to activate" and there you have it. When the boolean was set to false, the "ask to activate" dropdown option was unavailable.

Hope it helps.

HotSlyBrowser 0 solutions 1 answers

Thank you Thank you Thank you!

Users must do both. Set value to True (plugins.click_to_play - see above) AND set Shockwave to "ask to activate." I'm using FF 24.0 and Shockwave 11.8.8 and this combination worked perfectly for me. Thank you Mesem.