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YouTube High Definition Version History

146 versions

Be careful with old versions!

These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.

Version 42.2 136.0 KiB Works with Firefox 3.0 - 45.0, SeaMonkey 2.0 - 2.42

Channel Support

Version 42.1 135.5 KiB Works with Firefox 3.0 - 45.0, SeaMonkey 2.0 - 2.41

Cookie Bug Fix

Version 41.2 135.4 KiB Works with Firefox 3.0 - 45.0, SeaMonkey 2.0 - 2.41

Backward Compatibility Support

Version 41.0 135.4 KiB Works with Firefox 3.0 - 45.0, SeaMonkey 2.0 - 2.41

Auto Play Support

Version 40.1 133.4 KiB Works with Firefox 3.0 - 42.0, SeaMonkey 2.0 - 2.39

FlashBlock Support

Version 40.0 133.3 KiB Works with Firefox 3.0 - 42.0, SeaMonkey 2.0 - 2.39

Support for Recent YouTube Changes

Version 39.0 132.7 KiB Works with Firefox 3.0 - 43.0, SeaMonkey 2.0 - 2.39

Localization Support

Version 38.6 132.7 KiB Works with Firefox 3.0 - 42.0, SeaMonkey 2.0 - 2.39

Backward Compatibility Support

Version 38.5 132.4 KiB Works with Firefox 3.0 - 42.0, SeaMonkey 2.0 - 2.39

Support for Recent YouTube Changes

Version 38.4 128.2 KiB Works with Firefox 3.0 - 42.0, SeaMonkey 2.0 - 2.39

4K Video Support

Version 38.3.1-signed 128.2 KiB Works with Firefox 3.0 - 41.0, SeaMonkey 2.0 - 2.38

Critical Bug Fix

Version 38.2.1-signed 128.0 KiB Works with Firefox 3.0 - 41.0, SeaMonkey 2.0 - 2.38

Critical Bug Fix

Version 37.1.1-signed 120.6 KiB Works with Firefox 3.0 - 41.0, SeaMonkey 2.0 - 2.38

Support for Recent YouTube Changes

Version 37.0.1-signed 120.6 KiB Works with Firefox 3.0 - 41.0, SeaMonkey 2.0 - 2.38

Localization Support

Version 36.1.1-signed 120.4 KiB Works with Firefox 3.0 - 40.0, SeaMonkey 2.0 - 2.37

Support for Recent YouTube Changes

Version 36.0.1-signed 120.4 KiB Works with Firefox 3.0 - 40.0, SeaMonkey 2.0 - 2.37

Localization Support

Version 35.7.1-signed 117.8 KiB Works with Firefox 3.0 - 39.0, SeaMonkey 2.0 - 2.36

Options Support

Version 35.5.1-signed 114.7 KiB Works with Firefox 3.0 - 39.0, SeaMonkey 2.0 - 2.36

Support for Recent YouTube Changes

Version 35.4.1-signed 114.7 KiB Works with Firefox 3.0 - 39.0, SeaMonkey 2.0 - 2.36

Tiny Video Size Support

Version 35.3.1-signed 114.4 KiB Works with Firefox 3.0 - 39.0, SeaMonkey 2.0 - 2.36

Firefox Electrolysis Support

Version 35.2.1-signed 111.6 KiB Works with Firefox 3.0 - 39.0, SeaMonkey 2.0 - 2.36

Full Page Video Support

Version 35.1.1-signed 111.6 KiB Works with Firefox 3.0 - 38.0, SeaMonkey 2.0 - 2.35

Support for Recent YouTube Changes

Version 35.0.1-signed 111.5 KiB Works with Firefox 3.0 - 38.0, SeaMonkey 2.0 - 2.35

FlashBlock Support

Version 34.3.1-signed 111.1 KiB Works with Firefox 3.0 - 38.0, SeaMonkey 2.0 - 2.35

SeaMonkey Support

Version 34.2.1-signed 102.7 KiB Works with Firefox 3.0 - 38.0, SeaMonkey 2.0 - 2.35

HD Support for HTML5

Version 34.1.1-signed 102.7 KiB Works with Firefox 3.0 - 38.0, SeaMonkey 2.0 - 2.35

UI Adjustments

Version 34.0.1-signed 102.7 KiB Works with Firefox 3.0 - 38.0, SeaMonkey 2.0 - 2.35

Localization Support

Version 33.7.1-signed 102.6 KiB Works with Firefox 3.0 - 37.0, SeaMonkey 2.0 - 2.34

Support for Recent YouTube Changes

Version 33.5.1-signed 96.6 KiB Works with Firefox 3.0 - 37.0, SeaMonkey 2.0 - 2.34

Playlist Auto Play Support

Version 33.0.1-signed 95.4 KiB Works with Firefox 3.0 - 36.0, SeaMonkey 2.0 - 2.30

HTML5 Support