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YouTube is choppy when played fullscreen


This is Flash video -- when I play an HTML5 video, it's smooth (even at 1080p).

Vimeo & Hulu play smoothly in full-screen.

If the YouTube Flash video is embedded on a non-YouTube page, it's still choppy when made fullscreen.

IMPORTANT NOTE: Flash YouTube videos play full-screen smoothly in Chrome.

I have tried unchecking the "Enable hardware acceleration" box (with no success).

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.2 r202
  • The IcedTea-Web Plugin executes Java applets.
  • The Videos 3.6.3 plugin handles video and audio streams.
  • DivX Web Player version


  • Firefox 24.0
  • User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:24.0) Gecko/20100101 Firefox/24.0
  • Support URL: https://support.mozilla.org/1/firefox/24.0/Linux/en-US/


  • LastPass 2.5.0 (support@lastpass.com)
  • Mint Search Enhancer 1.0 (mint-search-enhancer@linuxmint.com)
  • Pocket 3.0.4 (isreaditlater@ideashower.com)
  • Stylish 1.0.7 ({46551EC9-40F0-4e47-8E18-8E5CF550CFB8})
  • Troubleshooter 1.1a (troubleshooter@mozilla.org)


  • incrementalGCEnabled: True


  • adapterDescription: ATI Technologies Inc. -- AMD Radeon HD 7700 Series
  • adapterDeviceID: AMD Radeon HD 7700 Series
  • adapterDrivers:
  • adapterRAM:
  • adapterVendorID: ATI Technologies Inc.
  • driverDate:
  • driverVersion: 4.2.12002 Compatibility Profile Context 9.01
  • info: {u'AzureCanvasBackend': u'cairo', u'AzureFallbackCanvasBackend': u'none', u'AzureContentBackend': u'none'}
  • numAcceleratedWindows: 0
  • numAcceleratedWindowsMessage: [u'']
  • numTotalWindows: 1
  • webglRenderer: ATI Technologies Inc. -- AMD Radeon HD 7700 Series
  • windowLayerManagerRemote: False
  • windowLayerManagerType: Basic

Modified Preferences

  • 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: http://www.linuxmint.com/start/olivia
  • dom.mozApps.used: True
  • extensions.lastAppVersion: 24.0
  • keyword.URL: https://duckduckgo.com/?t=lm&q=
  • network.cookie.prefsMigrated: True
  • network.protocol-handler.app.apt: /usr/bin/apturl
  • network.protocol-handler.app.apt+http: /usr/bin/apturl
  • network.protocol-handler.warn-external.apt: True
  • network.protocol-handler.warn-external.apt+http: True
  • places.database.lastMaintenance: 1380462306
  • places.history.expiration.transient_current_max_pages: 104858
  • plugin.disable_full_page_plugin_for_types: application/pdf
  • plugin.importedState: True
  • privacy.sanitize.migrateFx3Prefs: True
  • storage.vacuum.last.index: 0
  • storage.vacuum.last.places.sqlite: 1380380351


  • User JS: No
  • Accessibility: No
SHASHANK ROY 21 solutions 119 answers

Recent crashes of certain multimedia contents (this includes Youtube videos, certain flash games and other applications) in conjunction with Firefox are most probably caused by a recent Flash update and/or a malfunctioning browser plugin such as Real Player.

In order to remedy the problem, please perform the steps mentioned in these Knowledge Base articles:

Other, more technical information about these issues can be found under these Links:

Please tell us if this helped!

  • Top 10 Contributor
  • Moderator
10762 solutions 96861 answers

This is about Flash on Linux, so protected mode and other Windows issues do not apply.
The last version for Flash is 11.2.x and Adobe only provides security updates for this version.
Google Chrome uses different pepper Flash version on Linux that is still being updated just like the Windows version.