How to fix YouTube HTML5 playback?

All I want is to have 1080p available for YouTube with HTML5. The only way to achieve this I know of is enabling MSE (media source extensions). Enabling the required option [1] leads to stalled playback of videos. They don't play. Sometimes they do buffer. They may play for few seconds. Once they stall, it's done.
Additional info:
It seems that when HTML5 playback ceases to work, Firefox will also refuse to close its process upon closing.
[code]
Image PID Hard Faults/sec Commit (KB) Working Set (KB) Shareable (KB) Private (KB)
firefox.exe 1112 0 974 740 927 388 67 800 859 588
[/code]
What I have already tried?
confirming I'm actually on HTML5 player
Restarting without addons.
Clearing all history, cache, cookies etc.
enabling all 3 options below
[1] media.mediasource.enabled
[2] media.mediasource.mp4.enabled
[3] media.mediasource.webm.enabled
Related:
https://support.mozilla.org/en-US/questions/1027719
https://support.mozilla.org/en-US/questions/1006250
http://www.ghacks.net/2014/10/26/the-state-of-media-source-extensions-in-firefox/

Hello Ayanna R
Verify that you have done some of the other steps in the article below to resolve issues with audio playback. The only other advice I can give is updating iTunes.
iTunes and QuickTime for Windows: Audio does not play or plays incorrectly
http://support.apple.com/kb/ts1362
Regards,
-Norm G.

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Disclaimer: Apple does not necessarily endorse any suggestions, solutions, or third-party software products that may be mentioned in the topic below. Apple encourages you to first seek a solution at Apple Support. The following links are provided as is, with no guarantee of the effectiveness or reliability of the information. Apple does not guarantee that these links will be maintained or functional at any given time. Use the information below at your own discretion.
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1) If the iBook is running Mac OS X 10.4 (Tiger), disable Dashboard and Spotlight:
While widgets are fun and Spotlight is a useful quick search tool, they are known resource consumers that make video playback problematic for older Mac laptops, such as the iBook G3. To accomplish this, you will have to use the Terminal. Once the Terminal is open, enter the following command
{color:purple}defaults write com.apple.dashboard mcx-disabled -boolean YES{color}
After entering this command, you will then need to restart the Dock (Dashboard is owned by the Dock). To do so, again, using the Terminal, you will enter the following command.
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You may still see the Dashboard icon in the Dock, but clicking on it should do nothing.
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From here, you should press Ctrl+X to exit, upon which it will ask if you want to save. Follow the on screen prompts to save, and exit out of the Terminal. Spotlight will still appear in the corner of your screen, but it won't search for anything. Now on to the next step.
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Open the terminal and input the following command
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This is the 2nd version of this tip. It was submitted on May 19, 2010 by Macology, with thanks to Ronda Wilson.
Do you want to provide feedback on this User Contributed Tip or contribute your own? If you have achieved Level 2 status, visit the User Tips Library Contributions forum for more information.

Disclaimer: Apple does not necessarily endorse any suggestions, solutions, or third-party software products that may be mentioned in the topic below. Apple encourages you to first seek a solution at Apple Support. The following links are provided as is, with no guarantee of the effectiveness or reliability of the information. Apple does not guarantee that these links will be maintained or functional at any given time. Use the information below at your own discretion.
This is a brief tutorial on how to improve YouTube video playback on an Apple iBook G3. As of now, I have only tested this method on my own iBook. iBook's with lower specs than the 900 MHz model may not receive the same performance upgrade from this brief tutorial. With that said, here is what you can do to attempt to make YouTube more functional on your iBook G3.
1) If the iBook is running Mac OS X 10.4 (Tiger), disable Dashboard and Spotlight:
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{color:purple}defaults write com.apple.dashboard mcx-disabled -boolean YES{color}
After entering this command, you will then need to restart the Dock (Dashboard is owned by the Dock). To do so, again, using the Terminal, you will enter the following command.
{color:purple}killall Dock{color}
You may still see the Dashboard icon in the Dock, but clicking on it should do nothing.
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{color:purple}sudo nano /etc/hostconfig{color}
This will bring up a configuration listing. Use the arrow keys to scroll down and change the value, SPOTLIGHT=-YES-, to SPOTLIGHT=-NO-.
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1) How to Restore the Dashboard
Open the terminal and input the following command
{color:purple}defaults write com.apple.dashboard mcx-disabled -boolean NO {color}
After entering this command, you will have to restart the Dock. To do so, enter the following command into the terminal
{color:purple}killall Dock{color}
Now, can drag the Dashboard icon back to the Dock, or if you did not remove it to begin with, it should function once again.
2) How to restore Spotlight
Open the terminal and enter the following command
{color:purple}sudo nano /etc/hostconfig{color}
This will open up a config file. Scroll down (using the arrow keys) to the portion that says SPOTLIGHT=-NO- and change the value so that it says SPOTLIGHT=-YES-
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Best of luck to you all. I hope that this tutorial has been helpful.
This is the 2nd version of this tip. It was submitted on May 19, 2010 by Macology, with thanks to Ronda Wilson.
Do you want to provide feedback on this User Contributed Tip or contribute your own? If you have achieved Level 2 status, visit the User Tips Library Contributions forum for more information.

Tutorial: How To Improve Youtube Playback on iBook G3

Salutations,
this is a brief tutorial on how to improve Youtube video playback on an Apple iBook G3. As of now, I have only tested this method on my own iBook. iBook's with lower specs may not receive the same performance upgrade from this brief tutorial. With that said, here is what you can do to make Youtube functional on your iBook G3.
1) Disable Dashboard and Spotlight:
While widgets are fun and Spotlight is a useful quick search tool, they are known resource consumers that make video playback problematic for older Mac laptops, such as the iBook G3. To accomplish this, you will have to use the terminal. Once the terminal is open, enter the following command
defaults write com.apple.dashboard mcx-disabled -boolean YES
After entering this command, you will then need to restart the Dock (Dashbaord is owned by the Dock). To do so, again, using the terminal, you will enter the following command.
killall Dock
You may still see the Dashboard icon in the Dock, but clicking on it should do nothing.
For the next part, you will use the terminal to disable Spotlight. Open the terminal and enter the following command.
sudo nano /etc/hostconfig
This will bring up a configuration listing. Use the arrow keys to scroll down and change the value, SPOTLIGHT=-YES-, to SPOTLIGHT=-NO-.
From here, you should press Ctrl+X to exit, upon which it will ask if you want to save. Follow the on screen prompts to save, and exit out of the terminal. Spotlight will still appear in the corner of your screen, but it won't search for anything. Now on to the next step.
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