Why safari cannot play youtube

Lately, I find that Safari cannot play many of the videos on YouTube. Whereas Firefox can. Any explanation? Thanks.

YouTube requires the Flash plugin and there are times when it needs reinstalling.
Quit Safari.
Open System Preferences > Flash Player then select the Storage tab. Click: Delete All
Now uninstall the Flash plugin then reinstall new > Troubleshoot Flash Player | Mac OS
Very important to uninstall the currently installed plugin first before reinstalling.
Launch Safari. From your Safari menu bar top of your screen, click Safari > Empty Cache
Now try a video.
If you have the ClickToFlash extension installed, that can prevent Flash based video from streaming. It can also be installed as a plugin in /Library/Internet-Plug-Ins.
And check to see if Safari is running in 32 bit mode. Right or control click the Safari icon in your Applications folder then click Get Info. If the box next to: Open in 32 bit mode is selected, deselect, quit then relaunch Safari.
edited by: cs

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message edited by: cs

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== URL of affected sites ==
http://
== User Agent ==
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.1.249.1064 Safari/532.5

Application Basics
Name
Firefox
Version
3.6.3
Profile Directory
Open Containing Folder
Installed Plugins
about:plugins
Build Configuration
about:buildconfig
Extensions
Name
Version
Enabled
ID
Dealio Toolbar Plugin
4.0.2
true
[email protected]
Search Settings Plugin
1.2.3
true
[email protected]
Skype extension for Firefox
2.2.0.102
false
Java Console
6.0.02
true
Java Console
6.0.20
true
RealPlayer Browser Record Plugin
1.1.4
true
Veoh Web Player Video Finder
1.4
true
[email protected]
Modified Preferences
Name
Value
accessibility.typeaheadfind.flashBar
0
browser.places.importBookmarksHTML
false
browser.places.smartBookmarksVersion
2
browser.startup.homepage_override.mstone
rv:1.9.2.3
dom.max_script_run_time
0
extensions.lastAppVersion
3.6.3
network.cookie.prefsMigrated
true
places.last_vacuum
1274198820
privacy.popups.showBrowserMessage
false
privacy.sanitize.migrateFx3Prefs
true
security.warn_viewing_mixed
false

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Why safari cannot play youtube

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