quality Rated 4 out of 5 stars

best quality

Rated 4 out of 5 stars

خوب وراضی کننده

Rated 5 out of 5 stars

siiip

Rated 5 out of 5 stars

simple good

Rated 5 out of 5 stars

Good

Not consistently working Rated 3 out of 5 stars

For some videos, the quality goes up to 4K, for example: https://www.youtube.com/watch?v=ys3x43wtuJQ

Console log:
19:11:25.243 sfeerf = Object.assign(sfeerf, JSON.parse('{"hd":true,"quality":"hd1080","log":true}'));
inject.js:120:3
19:11:27.209 YouTube HD:: getAvailableQualityLevels returned empty array
videos:19:15
19:13:36.858 Loading failed for the <script> with source “https://www.youtube.com/yts/jsbin/www-pagead-id-vflByK66x/www-pagead-id.js”.
watch:1
19:13:37.283 YouTube HD:: Quality was hd2160 Changing quality is skipped
videos:26:15
19:13:41.591 Loading failed for the <script> with source “https://pagead2.googlesyndication.com/pagead/show_companion_ad.js”.
watch:1
19:13:42.131 Loading failed for the <script> with source “https://www.google.com/uds/api/ads/1.0/dffdf4a6b3a5f9d844bf06ffc6e853e6/content.I.js”.
watch:1
19:14:20.165 YouTube HD:: Quality was hd2160 Changing quality is skipped

Easy To Use! Rated 5 out of 5 stars

Really simple and easy to use addon that does what is described. :)

YouTube often selected 720p or sometimes lower settings, even on a 100mbit connection with a 1440p panel, so I kept having to manually select the quality with every video, but now I don't have to! :)

Rated 5 out of 5 stars

The best way to view videos when watching them on an Android Box (TV) with UHD (4K). Always the best resolution all the time.

This review is for a previous version of the add-on (0.2.2). 

Rated 1 out of 5 stars

不能使用,連個鬼都沒有

This review is for a previous version of the add-on (0.2.2). 

Rated 1 out of 5 stars

Does not seem to work in FF49.
When setting the preferred quality to 1080p youtube videos still load with 720p instead.

This review is for a previous version of the add-on (0.2.1). 

WIn XP/SP3 - Doesn't work Rated 1 out of 5 stars

Tried it on Firefox 49.0.2/WIn XP/SP3 but it doesn't work.
Youtube videos just have a black screen and don't play.

This review is for a previous version of the add-on (0.2.1). 

Please support 360p - 480p resolutions Rated 4 out of 5 stars

Please support 360p - 480p resolutions
and support embedded videos!

This review is for a previous version of the add-on (0.2.0). 

5*+ Rated 5 out of 5 stars

works, thx!

This review is for a previous version of the add-on (0.2.0). 

HD quality is switched Rated 5 out of 5 stars

I recommend this add-on to those who are connected to a high speed but unstable network. YouTube player usually selects a video quality upon loading. If it happens that at the measuring time the speed has been dropped, then YouTube will stream in low quality. This add-on successfully increased the quality back to HD with no problem.

This review is for a previous version of the add-on (0.2.0). 

2 stars!! Rated 2 out of 5 stars

this addon is solala...2 stars!

This review is for a previous version of the add-on (0.2.0). 

Rated 1 out of 5 stars

Nze fonctionne plus, j'abandonne.
Quand je mets la résolution voulue (1080p) à la main, la résolution revient d'elle-même en 720 voir 480...
J'ignore si le problème vient de cette extension ou deYoutube :/

This review is for a previous version of the add-on (0.1.7).  This user has 2 previous reviews of this add-on.

NOT WORKING!! Rated 1 out of 5 stars

Like i said in https://addons.mozilla.org/es/firefox/addon/youtube-hd-1/reviews/733214/ the plugin is not working.
it doesn't shows better resolutions than 360p.

This review is for a previous version of the add-on (0.1.7).  This user has a previous review of this add-on.

Stop autoplay Rated 5 out of 5 stars

Please add stop autoplay options.

This review is for a previous version of the add-on (0.1.3.1-signed). 

Rated 5 out of 5 stars

Excellent!
Please add an option to open the video in the bigger size, just like what you get when you click in the little rectangle (close to the gear) below the video. That will make this extension perfect.
Keep the great work!

This review is for a previous version of the add-on (0.1.3.1-signed). 

Rated 5 out of 5 stars

Thank you. Now it works.

This review is for a previous version of the add-on (0.1.3.1-signed).