Cant watch youtube 的最新解答https://support.mozilla.org/zh-TW/questions/11215552016-05-06T05:23:27-07:00i removed all the plugins and now it works again. Never download HD plugins again. The strange thing2016-05-06T05:23:27-07:00kevintycoonhttps://support.mozilla.org/zh-TW/questions/1121555#answer-873870<p>i removed all the plugins and now it works again. Never download HD plugins again. The strange thing is that when i de-installed Firefox it remembers all my plug-ins en settings when reinstalled.
</p>Hello,you can try to install the most recent version of Firefox, and that of the flash player plugin2016-05-05T07:35:16-07:00MozillaHelperhttps://support.mozilla.org/zh-TW/questions/1121555#answer-873548<p>Hello,you can try to install the most recent version of Firefox, and that of the flash player plugin. Then restart Firefox and see if the problem is solved.
</p>Firefox would normally use the HTML5 media player and not the Shockwave Flash plugin on the YouTube 2016-05-05T07:35:12-07:00cor-elhttps://support.mozilla.org/zh-TW/questions/1121555#answer-873547<p>Firefox would normally use the HTML5 media player and not the Shockwave Flash plugin on the YouTube website in current Firefox releases, so I assume that you use an extension to force using the Shockwave Flash based player.
</p><p>Do you have specific reasons not to use the HTML5 media player?
</p>
<hr>
<p>You can check for problems with current Shockwave Flash plugin versions and hardware acceleration in Firefox and try this:
</p>
<ul><li>make sure you have the latest Flash version:<br><a href="http://www.adobe.com/special/products/flashplayer/fp_distribution3.html" rel="nofollow">http://www.adobe.com/special/products/flashplayer/fp_distribution3.html</a>
</li><li>check for updates for your graphics drive drivers<br><a href="https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration" rel="nofollow">https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration</a>
</li><li>disable protected mode in the Flash plugin (Windows Vista and later)<br><a href="https://support.mozilla.org/kb/adobe-flash-protected-mode-firefox" rel="nofollow">https://support.mozilla.org/kb/adobe-flash-protected-mode-firefox</a>
</li><li>disable hardware acceleration in the Flash plugin<br><a href="https://helpx.adobe.com/flash-player/kb/video-playback-issues.html" rel="nofollow">https://helpx.adobe.com/flash-player/kb/video-playback-issues.html</a>
</li><li>disable hardware acceleration in Firefox<br><a href="https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration" rel="nofollow">https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration</a>
</li></ul>
<p>See also:
</p>
<ul><li><a href="http://kb.mozillazine.org/Flash#Troubleshooting" rel="nofollow">http://kb.mozillazine.org/Flash#Troubleshooting</a>
</li></ul>