El capitan Safari won't play YouTube videos

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• Why the latest Firefox won't play YouTube videos

  Everything worked fine until the latest version of Firefox, now I can't play YouTube videos. No problem with Chrome or IE. Firefox screwed up something with their latest version. Problem started on 09/03/15.

  1) enter the config by typing about: config in the address bar.
  (2) enter media.mediasource.webm.enabled press ENTER.
  (3) make a right click on it and change to true, for some reason any, defined as 'false', which makes the MSE & WebM VP9 does not work correctly.
  (4) visit: https://www.youtube.com/html5 and check that everything is OK.
  (5) tries to watch a video. It should work now.

• Firefox 7 won't play YouTube videos

  Running Win7 x 64. Upgrade to Firefox 7, then YouTube videos stopped playing. YouTube keeps insisting that I have to install the latest flash player, what I've done several times ("install_flashplayer10_mssa_aih.exe" and "install_flashplayer11x64_mssa_aih" versions), clear cookies, restart and all that crap. Firefox refuses to play YouTube videos. Internet Explorer 9 (x 64) plays great YouTube videos. Don't use Firefox more. You've got to SUPPORT your application instead of users leaving Wade. It is also why I HATE the upgrade. It causes too often new incompatibilities when I just want to leave what works, the hell alone.

  The Adobe forum, someone suggested

     * go to http://forums.adobe.com/thread/909550 and
           o download the 64-bit uninstaller
           o download the 64-bit installer
     * close all browser windows, then run the downloaded uninstaller
     * restart Windows
     * delete any remaining files in
           o C:\Windows\system32\Macromed\Flash
           o C:\Windows\syswow64\Macromed\Flash
     * now run the downloaded installer
  

  It still does not work. Then someone else said to install the ActiveX Installer, I found somewhere online.

  THEN finally it worked. But I still don't understand why I have to jump through additional hoops, which are not explained in the first place-YT says I need to upgrade (even if my old machine W2k with FF 3 and Flash 10 works fine), I click on the link on YT taking me to Adobe, I download and install like lead instructions , but it does not work. Why didn't ActiveX installs as well as the installer of Flash if necessary?

• Safari Version 10.0 (11602.1.50.0.10) won't play YouTube videos.

  New version of Safari (Version 10.0 (11602.1.50.0.10) will not play videos from YouTube.) I get a message saying that Safari does not support any video format.

  Safari > Preferences > Extensions

  Uncheck the boxes next to all extensions and test them.

  Enable the extensions one by one and test.

  To uninstall an extension, select it and click the "Uninstall" button

  Click here for the extension plug can cause this kind of problem.

• V27, 27.1, won't play YouTube videos. Even in safe mode

  I can't watch videos on my default browser, the latest Firefox v 27. I think that I am not alone in this.

  I do not have the latest versions of Flash Player, Real Player, and Javascript is enabled (not java)

  I found it first in the videos of my favorite site of cats (cheezeburger..), but I just find that it comes up with videos of Serif community more. Video accessed via FP work, even when the so-called YouTube (clicked)

  Work live YouTube videos, but not the videos of YouTube accessible via cheezburger links.

  These defects occur only in Firefox 27 and videos play OK in Maxthon 3, (Chrome and Opera - the last time I checked). I know that you do not recommend this but can tell you exactly how to reload the previous version of Firefox, V26 - I had no problem with that.

  I tried to run FF27 in safe mode, no effect. I don't want to lose the different add-ins I use, if I don't want to reset to the factory settings.

  I think is not necessary.

  Click with the mouse right button on the Bookmarks box or in the bar (press F10 or alt to see the title bar) title, and then click Customize

  Then drag the address located above the tabs of stripe bar and.

  • Customize toolbars

  Go to Subject: config search browser.tabs.closeWindowWithLastTab change itsvalue false

  • Subject: config

• update won't play youtube videos

  so I updated my iphone5 to the last ios 9.3.2 and the youtube site or custom app play videos. no idea how to address this issue.

  Try restarting of strength:
  Hold the home and power buttons at the same time until the Apple start-up logo appears.

• Safari 6.1.1 does not play youtube videos. Can someone help me please? Problem started today.

  Hello

  Today my MBP, Safari 6.1.1. stop playing youtube videos. YouTube says safari is obsolete. What should I do? Thank you.

  Upgrade the operating system to a newer version or try another browser that is out of date.

  Firefox

  Opera browser

• Whenever I play youtube videos, they shake from left to right and to go at different speeds.

  I have windows 7. A couple of days, I went to play youtube videos and they all shake from left to right and go at different speeds (very erratic). This ONLY happens with videos from youtube (HTML5). When I play other videos(non-HTML5), they play very well. Also, the sound on youtube videos are fine, only they do not match the mouth (s) of people talking. The mouth move faster. I've checked all my plug-ins and everything is up-to-date. My firefox browser is also the last version. I did a malwarebytes scan and it came up with nothing. All the settings on the youtube videos are also where they should be. It happened for about 5 days. Can someone help me?

  Thanks Guigs. I followed your instructions and found out it was a 'acceleration hardware problem' that was the origin of the problem. I unchecked the box and YouTube videos play very well! Thank you for taking the time to help me.

• Why I can't play youtube videos?

  When I try to play youtube videos it is not play and it gives out message lik e "year error occurred, please try again later." but when I play the same thing on chrome, it worked, I installed the flash player lasted, but still I get this error please help me.

  Reload the Web page while bypassing the cache

  • Hold down the SHIFT key and click the reload with a left click button.
  • Press Ctrl + F5 or Ctrl + SHIFT + R (Windows and Linux)
  • Press command + SHIFT + R (Mac)

  Clear the cache and cookies from sites that cause problems.

  Clear the Cache: Tools > Options > advanced > network > storage (Cache) offline: 'clear now '.

  Remove the Cookies from sites causing problems:

  • Tools > Options > privacy > Cookies: "show the Cookies".

• Cannot play youtube videos unless on youtube.

  Recently my system seems to not being able to play youtube videos, at least on youtube. any other site that the video can be integrated into it just lies at 00:00 on the loading of the file. I've tried disableing all the addons. and videos refuse even to load or be played unless I came to youtube to do.

  Clear the cache and cookies from sites that cause problems.

  "Clear the Cache":

  • Tools > Options > advanced > network > content caching Web: 'clear now '.

  'Delete Cookies' sites causing problems:

  • Tools > Options > privacy > Cookies: "show the Cookies".

  Start Firefox in Safe Mode to check if one of the extensions (Firefox/tools > Modules > Extensions) or if hardware acceleration is the cause of the problem (switch to the DEFAULT theme: Firefox/tools > Modules > appearance).

  • Do not click on the reset button on the start safe mode window or make changes.
  • https://support.Mozilla.org/KB/safe+mode
  • https://support.Mozilla.org/KB/troubleshooting+extensions+and+themes

• I can't play YouTube videos, or open Flash on Firefox-based pages. I have already installed the plugin Flash a number of times.

  Can't play YouTube videos and cannot load Flash components, which work on other browsers.

  There are some compatibility issues between the last Flash drive and a few Add-ons Firefox or settings. Could see you if anything in this article helps you: 11.3 Flash does not load video in Firefox.

• I can't play youtube videos or access games on facebook

  I can't play youtube videos or access games on facebook and some websites, I get only 1/2 the page. It seems that something is blocking my flash. It says that my flash is updated and also of shockwave. I have included 2 screenshots. I started in safe mode and nothing works. Works perfectly in google chrome. The problem is that firefox. Any ideas?
  http://i431.Photobucket.com/albums/qq36/otter2208/YouTube.jpg
  http://i431.Photobucket.com/albums/qq36/otter2208/face-1.jpg
  I goto my plugins and see shockwave flash only. Also, I tried other sites with video and video shoot at all.

  I tried to download an old version, but it would not move for some reason any. I did a system restore and now everything works. I have firefox WILL NOT update until THAT can't solve their problems.

• This plug-in is used to play YouTube videos?

  I clicked on a link in an e-mail to a video from YouTube. I received an error message in Safari, 'plugin blocked.' This plug-in is necessary to play the videos? Using Snow Leopard 10.6.8. Thank you.

  My inclination would be to switch to Firefox for a newer browser, if even it will stop supporting OSX 10.6 if it isn't already.

• Firefox plays Youtube videos not, please help?

  Simple question, yet nothing I've tried has worked. The video is just a black rectangle on the page. It happens with all the videos on Youtube.

  I had version 12 of Firefox and it has not worked, put at 13, still does not. I do not have real player installed, I downgraded Flash 10 something points, disabled the flash Shockwave and still they won't play! SE ticked off and sick of having to use IE.

  Someone help me please?

  Start Firefox in Safe Mode to check if one of the extensions or if hardware acceleration is the cause of the problem (switch to the DEFAULT theme: Firefox/tools > Modules > appearance/themes).

  • Makes no changes on the start safe mode window.
  • https://support.Mozilla.org/KB/safe+mode
  • https://support.Mozilla.org/KB/troubleshooting+extensions+and+themes

  Try disabling hardware acceleration in Firefox.

  • Tools > Options > advanced > General > Browsing: "use hardware acceleration when available.
  • https://hacks.Mozilla.org/2010/09/hardware-acceleration/
  • https://support.Mozilla.org/KB/how-do-i-upgrade-my-graphics-drivers

  Try to "disable hardware acceleration" in the Flash Player.

  • http://helpx.Adobe.com/Flash-Player/KB/video-playback-issues.html

  See also:

  • https://support.Mozilla.org/KB/keep-Flash-up-to-date-and-troubleshoot-problems

  Blink the window "display settings":

  • http://www.Macromedia.com/support/documentation/en/flashplayer/help/help01.html

• BlackBerry Smartphones can not play youtube video with the 3G network, but works with WiFi, why? Help, please!

  Hello

  I tried several times to read the youtube videos with network wifi and it works fine, but when I use the 3G or GPRS nework to play the video, it first to ask "Switch to WAP for streaming media? (with wifi that he won't ask) so I press ok and it uptempt to load and an error message "content not available. Server is blocked or unresponsive. ", it goes with all the videos I click on that. Help, please.

  Thank you

  Let me share my personal experience on the subject. When they are facing the same problem, I asked my provider and they tried to pull a fast explaining that viewing videos on the 3G network is dependent on the device and that it is not possible to videos on my BB "BOLD" due to speed issues. They even suggested that I buy an iPhone 3G given that subscribers who do not seem to display YouTube videos problems. A load of rubbish! After only a brief workshop organized by RIM and my career, I was "unofficially" informed by a member of staff that it was a TCP/APN issue. I take advice, made the necessary adjustments, and was able to view Youtube videos on the 3 G network without problem. However, my Bill the next month floored me. Even if I'm on a package data unlimited, I was charged an extra $ 70 on top of what I usually pay. Learn more with my carrier, they were kind enough to inform me that I have to access the Internet via their APN address, which translates into a lower speed of AFN, orI will have to pay for accessible data on the other addresses of the AFN. I supported with my questions and my carrier eventually admitted that they were actually limiting the speed on AFN as allowing only some mobile devices to access data at 3G speed. Then you tell me!