Các câu trả lời gần đây cho No sound on Youtube with FF 16, 17 and Flash Player 10 and upwardshttps://support.mozilla.org/vi/questions/9423852012-11-21T07:36:55-08:00Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as 2012-11-21T07:36:55-08:00cor-elhttps://support.mozilla.org/vi/questions/942385#answer-382818<p>Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
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<ul><li><a href="http://windows.microsoft.com/en-US/windows7/Advanced-startup-options-including-safe-mode" rel="nofollow">http://windows.microsoft.com/en-US/windows7/Advanced-startup-options-including-safe-mode</a>
</li></ul>
<p>Try to clear the Flash local storage and settings.
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<ul><li>Windows Control Panel &gt; Flash Player &gt; Storage: Local Storage Settings
<ul><li>Remove a specific domain: Local Storage Settings by site
</li><li>Remove all domains: Delete All and Delete Data
</li></ul>
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<p>Flash Website Storage Settings panel:
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<ul><li><a href="http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html" rel="nofollow">http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html</a>
</li></ul>
<p>Global Storage Settings Panel:
</p>
<ul><li><a href="http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager03.html" rel="nofollow">http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager03.html</a>
</li></ul>Reset did not work either,
The only thing that works seems to be creating a brand new profile, from2012-11-21T06:44:26-08:00SCHVEDKAhttps://support.mozilla.org/vi/questions/942385#answer-382802<p>Reset did not work either,
The only thing that works seems to be creating a brand new profile, from scratch.
</p>As soon as I copied over the information from the old user folder to the new user folder, the proble2012-11-21T06:37:13-08:00SCHVEDKAhttps://support.mozilla.org/vi/questions/942385#answer-382796<p>As soon as I copied over the information from the old user folder to the new user folder, the problem returned. I've spent 5 hours on this now.&nbsp;:-(
So irritated.
</p><p>I'll reset Firefox but it's clear from the information that I'll have to spend ages then trying to locate all the extensions, do a fresh install of the extensions one by one. This is what I wanted to avoid doing.
</p>I'm going to bet it was your extensions. Even running with them disabled doesn't revert any settings2012-11-21T05:27:57-08:00user633449https://support.mozilla.org/vi/questions/942385#answer-382778<p>I'm going to bet it was your extensions. Even running with them disabled doesn't revert any settings they may have changed that could have caused this.
</p><p>Transfer your information from your old profile to your new profile, and then re-install your extensions. That is the most time-efficient way to do this. <a href="/en-US/kb/recovering-important-data-from-an-old-profile" rel="nofollow">Recovering important data from an old profile</a>
</p>Hi again! I did something similar to reset; I created a new profile.
With this profile, the sound w2012-11-21T05:25:21-08:00SCHVEDKAhttps://support.mozilla.org/vi/questions/942385#answer-382777<p>Hi again! I did something similar to reset; I created a new profile.
With this profile, the sound works. I don't understand why, since I disabled all extensions with my regular profile, and still had the problem....
</p><p><strong>But how do I find out what the problem with my current profile is...?</strong>
</p><p>It is set up just so... I've got about 30 extensions active and some of them have settings. I want it exactly the right way otherwise I might as well use Chrome...
</p>A reset does restore your information, but if you want to backup anyway, read Back up and restore in2012-11-21T04:47:37-08:00user633449https://support.mozilla.org/vi/questions/942385#answer-382763<p>A reset does restore your information, but if you want to backup anyway, read <a href="/en-US/kb/back-and-restore-information-firefox-profiles" rel="nofollow">Back up and restore information in Firefox profiles</a>
</p>Hi - yes, no worries, I did what you said anyway, and re-installed 11.5.
There is no difference. Th2012-11-21T04:44:08-08:00SCHVEDKAhttps://support.mozilla.org/vi/questions/942385#answer-382761<p>Hi - yes, no worries, I did what you said anyway, and re-installed 11.5.
There is no difference. There is sound to some videos, but not others.
</p><p>I've cleared the Flash cache and the FF cache.
I am very reluctant to reset, but I'll try it as a last resort if I can figure out a way to backup everything first.
</p><p>Sound for these two videos does not work. One is old, one is new....
</p><p><a href="http://www.youtube.com/watch?v=I_NKU5ofJfA" rel="nofollow">http://www.youtube.com/watch?v=I_NKU5ofJfA</a>
<a href="http://www.youtube.com/watch?v=dXTRANvdouQ" rel="nofollow">http://www.youtube.com/watch?v=dXTRANvdouQ</a>
</p><p>Sound for these two works:
<a href="http://www.youtube.com/watch?v=sQGujsHcq6U&amp;feature=related" rel="nofollow">http://www.youtube.com/watch?v=sQGujsHcq6U&amp;feature=related</a>
<a href="http://www.youtube.com/watch?v=tfrWuiQ4QNc&amp;feature=related" rel="nofollow">http://www.youtube.com/watch?v=tfrWuiQ4QNc&amp;feature=related</a>
</p>Yes, but I would like you to update to 11.5 again, and try more troubleshooting steps with that most2012-11-21T04:36:03-08:00user633449https://support.mozilla.org/vi/questions/942385#answer-382758<p>Yes, but I would like you to update to 11.5 again, and try more troubleshooting steps with that most recent version of flash.
</p>Hi, Thanks for the response. I probably wasn't clear enough, but I have already been on Flash Player2012-11-21T04:21:51-08:00SCHVEDKAhttps://support.mozilla.org/vi/questions/942385#answer-382753<p>Hi, Thanks for the response. I probably wasn't clear enough, but I have already been on Flash Player 11.5 with no success.
</p>Try the following:
Update to flash player 11.5.
Try the suggestions at Flash 11.3 doesn't load video2012-11-21T03:44:38-08:00user633449https://support.mozilla.org/vi/questions/942385#answer-382740<p>Try the following:
</p><p>Update to flash player 11.5.
</p><p>Try the suggestions at <a href="/en-US/kb/flash-113-doesnt-load-video-firefox" rel="nofollow">Flash 11.3 doesn't load video in Firefox</a>
</p><p>If that doesn't work try to reset Firefox <a href="/en-US/kb/refresh-firefox-reset-add-ons-and-settings" rel="nofollow">Refresh Firefox - reset add-ons and settings</a>
</p>