Youtube High Definition


Youtube High Definition How to Use Guide Image

Congratulations! Youtube High Definition installed successfully. You can right now start using your new add-on.


YouTube High Definition is a powerful tool that will let you play all YouTube videos in High Definition automatically.

YouTube High Definition solves a common annoyance which YouTube does not chose the best resoulution for the currently playing YouTube video although there is a better video resolution. Switching manually to a better resolution is awkward and difficult. YouTube High Definition solves this common annoyance and loads all YouTube videos in Highest Resolution automatically for you.

You can click on the red toolbar button of YouTube High Definition to get the add-on options panel. You can change the video quality and size of the Youtube video player by the relevant option areas. All changes are applied instantly and saved permanently.

YouTube High Definition can play 4K, 1080p and 720p High Definition options but by default YouTube High Definition decides to play highest resolution for you.

YouTube High Definition not only loads the highest available resolution but plays the videos in Wide or Full Page style to better improve the High Definition experience.

YouTube High Definition does not only supports YouTube videos but Facebook, Twitter and Reddit YouTube videos in High Definition.

YouTube High Definition also helps listening YouTube songs in High Definition which will will improve the sound quality significantly.

Popular Flash add-on FlashBlock is also supported to play videos in High Definition.



If you find the application useful please support my development efforts.


14 Responses to “Youtube High Definition”
  1. Guddu Bhagat says:

    Awesome :)…. thank you for creating such add-ons :)……

  2. Miss M says:

    I love Firefox and all the add-ons! I just installed them and restarted browsing with them just now. Now I can finally watch videos in HD.. Things just kept getting cooler nowadays, you have to catch up. Thank you so much! God bless!

  3. mohamed-aboumouad says:

    I enjoyed so much your application. thank you very much.

  4. Thomas says:

    Great job guys, but I would really appreciate it if it could toggle to full screen while playback and back to maximal size to choose the next video.
    Greetz

  5. Albin says:

    It’s a very nice addon, I don’t know how I earlier managed to use youtube without it.

  6. Futile says:

    Thank you so much for this extension. I listen to a lot of playlists on youtube and get really tired of having to change the quality for each song. This truly made my day. If I wasn’t a broke a$$ I would donate, but unfortunately I am.

    Thanks again.

  7. Hla Thein says:

    Thanks so much for your contributions

  8. SDC says:

    It’s a great plugin, automatically starts video with Hi-Def and Large format. Good job.

  9. Hibben says:

    Been searching for a solution to this for a while now. Thanks so much for this!!

  10. Kerri Salzbrun says:

    I am anxious to check it out!!! YouTube just keeps getting better and better all the time!

  11. dvd4u888 says:

    Great!!!!!! more videos and music to see and listen….

  12. Cee David says:

    I have used a few of your add-ons and like most of them. I am a retired WWII – Korean veteran living on social security. I do not have a credit card nor do I wnt one. I would like to donate, perhaps with a postal money order. I will try this HD for sure.

  13. Angshelshang hongsha says:

    Awesome…..Thanks a million to the person who create this…

  14. I enjoy so much your application.thank you very much.