Icon on toolbar Rated 5 out of 5 stars

Please add icon to this addon on toolbar, as a short cut to options. It will be helpful... Beside this- great addon!

Does not work for me but am I really the only one? Rated 1 out of 5 stars

Anyway, will try to keep it short; but basically this causes YouTube to load a black screen. I can see the video buffering, but nothing is playing.

I click on it and then it switches to PAUSE icon. I click on it again and then it does the spinning loading graphic. If I manually jump ahead in the video it plays normally.

I do not have FLASH installed. I finally removed this and just installed - DISABLE HTML5 AUTOPLAY - and everything works normally. No flash so Firefox should be loading HTML5 by default, but the autoplay seems to load a black screen. With this OTHER Add-On it is paused and the click loads and plays the HTML5 video fine.

5 stars - i love it! Rated 5 out of 5 stars

so many functions this small fucking cool and helpfull addon bravo!
for me 5 stars!

This review is for a previous version of the add-on (3.1.0). 

Nice but... Rated 5 out of 5 stars

Very nice. But I wish it also works in YouTube videos embedded in other websites.

This review is for a previous version of the add-on (3.1.0). 

Thank you!

What feature would you like to work in embedded videos? The add-on already tries to also force html5 in embedded videos.

almost perfect just a suggestion Rated 4 out of 5 stars

You're missing an option to use mp4 (h264) as the preferred format
while google prefers mp4 on windows vista+ it forces webm on Linux's

there are several reasons to prefer h264 instead of vp9 as:
#1 hardware decoding only recent and expencive gpu's have vp9 hardware decoding while 10 year old gpu's can decode h264
#2 Video quality
this is subjective but imo there is a lot less pixelation and ringing in h264 compared to vp9
#3 File size
mp4's are 5-10% smaller then the equivalent webm files

afaik hardware decoding is done by the backend ie ffmpeg
(gstreamer was dropped by mozilla) I might be wrong but I do belive ffmpeg does hardware decoding if your hardware supports it
only new nvidia chips have partial vp9 support 960 and above (titan X has full)
and on intel's side partial vp9 support was introduced with the Skylake processors (full with Kaby Lake)
only a fraction of desktop hardware has vp9 support
regarding vp9 30% smaller lol that's google propaganda for example at 360p
the mp4 is 40.7M
the webm is 53.2M and is 7% bigger
I am using this script to get the file sizes
it doesn't get webm's at higher res I'm not sure why

still I think it's google's bug if it sees Linux in the browser user agent it prefers vp9 I ended up disabling webm
but I think you can add an option to prefer h264

This review is for a previous version of the add-on (3.1.0). 

While I agree that some older systems might have problems decoding high-res VP9 videos, the same is true for H264, as firefox currently does not support any video hardware decoding on linux [1]. And when comparing decoding speed, VP9 is typically equally fast when comparing videos with the same quality, because in VP9 they then need a much lower bitrate [2, section "Decoding speed"].

This is also the reason why VP9 videos on youtube are in every case I have seen smaller than their H264 counterparts, usually around 30 to 40 % (you can easily check all available resolutions and their sizes using youtube-dl).

But like mentioned in the description, if you really want, you can control WebM/VP9 with the media.mediasource.webm.enabled setting in about:config. Note that the youtube html5 test site has a bug in that it shows VP9 as enabled even if it is not, however it falls back to H264 when actually playing a video.

[1]: https://bugzilla.mozilla.org/show_bug.cgi?id=1210726
[2]: https://blogs.gnome.org/rbultje/2015/09/28/vp9-encodingdecoding-performance-vs-hevch-264/

I did a test and VP9 and H264 decoding resulted in exactly the same CPU usage on my system. about:support also tells me under "Hardware H264 Decoding" that it is not supported, even though it uses ffmpeg as backend on my system as well.

Regarding the sizes of the video you mentioned, this is what youtube-dl tells me: (excerpt)
243, webm, 640x360, DASH video 457k, vp9, 24fps, video only, 21.59MiB
134, mp4, 640x360, DASH video 606k, avc1.4d401e, 24fps, video only, 24.65MiB
244, webm, 854x480, DASH video 823k, vp9, 24fps, video only, 37.29MiB
135, mp4, 854x480, DASH video 1112k, avc1.4d401e, 24fps, video only, 46.88MiB
247, webm, 1280x720, DASH video 1635k, vp9, 24fps, video only, 73.36MiB
136, mp4, 1280x720, DASH video 2206k, avc1.4d401f, 24fps, video only, 81.69MiB
So VP9 is smaller in every case there as well.

The difference you see are these non-mse files:
43, webm, 640x360, medium, vp8.0, vorbis@128k, 53.23MiB
18, mp4, 640x360, medium, avc1.42001E, mp4a.40.2@ 96k, 40.73MiB
But the webm file in this case contains VP8 and not VP9 and a higher bitrate audio track, so naturally it is larger.

Regarding a setting to disable VP, what is wrong with media.mediasource.webm.enabled?

Some new problems with other add-ons in latest version Rated 3 out of 5 stars

(Response to my previous rating and the dev comment)


It seems that with the latest version there are some problems with /some/ videos which do not start uninitialized in conjunction with the FlashStopper add-on;
You mentioned that you redid the "Start videos paused" option (which indeed seems to work more reliable now when enabled) but since it still displays an ugly black screen (and also initializes the video in the first place) I chose to set it to "Never" and let the "FlashStopper" add-on do this instead.

Unfortunately I think the redone option messes with FlashStopper as they might be accessing the same variable and override each other or something so that some videos start uninitialized (the way I want it) while others start playing right away (which is somewheat annoying).

Would it be possible for you to add an option to start the video uninitialized (with the thumbnail and play-button in the middle) instead, even if there hasn't been much demand for this yet, as you said before?


The same goes for when the video has finished: In that regard the "Prevent autoplay of recommended videos" option is nice but it should not remove the thumbnail in the background and the recommended video tiles that appear when pressing cancel on the autoplay without this add-on.


I'm not sure that the "Video playback rate" option is needed since the HTML5 player on YouTube already has that option built-in but it's only used once every blue moon.


I like the new "Video volume" option however, since I like to keep the volume at 50% so I have room to go up or down. So it's nice to have the 50% value in there. Although I think other people might find the rest of the values a bit sporadic. I don't think I remember any add-on with a slider (for precise percent values) on the options page within the about:addons page (maybe not even add-ons which open their own small options window) so I'm not sure whether this would be even possible. Alternatively I'd suggest to make the values go up in 10% increments instead. Or a numeric input field which get's clamped between 0 and 100% if that's possible.


Keep up the good work! ;)

This review is for a previous version of the add-on (3.1.0).  This user has a previous review of this add-on.

Thanks for your response! (you can also send me an email or open an issue at github if you like)

I am not sure how the new "start paused" option could interfere with FlashStopper, as it literally does nothing [1] when the feature is not enabled. Does this always happen with the same videos? If yes, could you send me an example? I will have a look at a hypothetical "Start videos stopped" option for the next release.

The "Prevent autoplay" option does exactly the same as the slider that is present on every youtube video page by default (by sending the same cookie that youtube uses to store this setting), so if this results in the recommended video tiles in the player being hidden, this is likely a bug of youtube or another extension.

The playback rate, volume, hide annotations and prevent autoplay features (which are all available directly through the youtube interface) are mainly targeted at users who regularly delete their cookies and so loose their settings.

I tried to make a compromise with the volume levels, because a slider or a numeric field with +/- buttons is unfortunately not possible. I don't like simply putting a textbox there, however this may be nonetheless the most practical solution, we'll see.

[1]: https://github.com/klemens/ff-youtube-all-html5/blob/4c919d/data/youtube-video-quality.js#L113-L129

Convert to non-sdk Rated 5 out of 5 stars

Hi. I use the Pale Moon browser and version 27 will make jetpack/sdk extensions not work. I love this extension and would love to continue to use it. Can you please convert? Thanks!

This review is for a previous version of the add-on (3.0.3). 

That is really unfortunate, as the addon makes heavy use of some add-on sdk features.

What do you mean with non-sdk? A classic restartless XUL extension or a WebExtension? As firefox is working on dropping XUL support, I won't convert the addon to the former, sorry.
However as the APIs for WebExtensions become more complete, I think I'll try porting the addon to it. I am not sure what Pale Moon plans to support in the long term, but it currently seems they won't support WebExtensions any time soon.

Having said that, it is certainly *possible* to convert the addon to a classic XUL addon, I just won't be the one doing it. But if anyone wants to try that, I will happily answer questions.

Edit: The new version 3.1.1 now supports pale moon starting with pale moon version 27.1!

Nope Rated 1 out of 5 stars

Doesn't work. Turned all my videos black instead. I can't find anything that actually works.

This review is for a previous version of the add-on (3.0.3). 

I am sorry that it does not work for you. You can open an issue at github ("Support site") or send me an email if you want and I will try to help you debug this problem.

Some information that would be useful are the version of the addon, os and firefox you are using and if you have flash installed and/or enabled.

You could also try the new beta version 3.1.0 beta 3 (https://addons.mozilla.org/en-US/firefox/addon/youtube-all-html5/versions/3.1.0-beta3) and see if it works with that.

Thanks Rated 5 out of 5 stars

perfect to pc low very very low

This review is for a previous version of the add-on (3.0.3). 

Rated 3 out of 5 stars

I had some problems with this. It worked sometimes ... and sometimes didn't. Good idea, though.

This review is for a previous version of the add-on (3.0.3). 

Could you be more specific about the things that don't work as expected?
I also just uploaded a new beta version that fixes some long-standing problems, see here for details: https://addons.mozilla.org/firefox/addon/youtube-all-html5/versions/beta

Great! Rated 5 out of 5 stars

It's working.

This review is for a previous version of the add-on (3.0.3). 

Wonderful! Buh-Bye slow and crashy FlashPlayer. Rated 5 out of 5 stars

Since Macromedia convinced coders that Flash was the future, I have hated it. It's slow, crashy, and just plain annoying. This add-on is fixing my internet experience. I only wish it worked on everything flash!

This review is for a previous version of the add-on (3.0.3). 

Not tech-savvy Rated 1 out of 5 stars

Don't know enough to configure and maintain an alternate OS, and will not spend more money on Microsoft product.

The lack of support for XP is understandable in context but disappointing.

It's good to be one day closer to death.

This review is for a previous version of the add-on (3.0.3). 

I can understand your anger, but this is a firefox problem. Firefox does not support H264 under windows xp, because the H264 codec is only built into windows since vista.

Although this might seem as a strange advice, you could try chrome which seems to support h264 under xp as yet.

Edit: It seems Firefox supports VP9/MSE under Windows XP, which should make YouTube work without problems.

Very Good Rated 5 out of 5 stars

Very good add-on , integrates well with YouTube and is light on resources, but icon's missing from add-ons manager(at least for me) and needs volume control. Thank you.

Edit: Glad to hear about the icon and yes that's what I mean by volume control, I think it would be useful especially with headphones. Again, thank you for all your efforts.

This review is for a previous version of the add-on (3.0.3). 

Yup, the icon went missing when I switched to the new packaging tool with the last update. Should be back with the next release [1].
I am not sure what you mean by volume control? Do you mean forcing other levels than 100%?

[1]: https://github.com/klemens/ff-youtube-all-html5/commit/9c34

Edit: Extended volume control is now implemented in 3.1.0-rc1 [2] and will be part of 3.1.0.

[2]: https://addons.mozilla.org/firefox/addon/youtube-all-html5/versions/3.1.0-rc1

severe jitter on fullscreen view. Rated 1 out of 5 stars

severe video jitter on fullscreen view. No better than default youtube player.

This review is for a previous version of the add-on (3.0.3).  This user has a previous review of this add-on.

There seems to be a misunderstanding here. My addon forces (i. a.) the use of YouTube's own HTML5 player for people which normally get the Flash-based player. It does not include it's own player.

It is hard to say from here where your playback problems might come from, but old Firefox versions, disabled hardware acceleration or broken graphics drivers often cause problems with video playback.

Wonderful Rated 5 out of 5 stars

Sometimes it even allows to save videos in resolutions not allowed by flash addons. F.e. https://www.youtube.com/watch?v=DmeUuoxyt_E

To save any video:

click the small icon in the address bar, just before http://

click "More information"

click "Media" tab

you will see a long list of files but only one says "video" in the "type" column; click on that one;

click "Save As" then change the extension to .avi;

Thanks for the GNU licence!

This review is for a previous version of the add-on (3.0.3).  This user has a previous review of this add-on.

Thanks for your review!

Another great tool for downloading videos from youtube is youtube-dl (https://rg3.github.io/youtube-dl/). It also supports downloading videos that use MSE, which you cannot save using the browser directly.

The developer is great! Rated 5 out of 5 stars

Unfortunately, it's only working function is HTML YouTube player (who would have thought, yeah?), but function "auto pause" does not, also "Disable Flash on YouTube" has wrong name , it should include "only" like "Disable Flash on youtube only". Also there is no "disable annotations" function.
I look forward for fixing those tree mistakes, thanks for reading.

UPD1: Got your answer. Well, I did mean that disabling Flash can cause it's disable also on other websites, not only YouTube. This option disables Flash ONLY on YouTube, right? So call it so please, if I'm right.
Nope, restarting the browser didn't help, unfortunately, still using YouTube CC addon.

UPD2: Now it works properly, thanks for your time and efforts. 5 stars to Griffindoor!

This review is for a previous version of the add-on (3.0.3). 

Starting videos paused can sometimes be a bit buggy, but generally it works fine for me and most users that I talked with. However sometimes you have to restart your browser after you enable this option (or any other option, see the description). I will see if I can find a workaround for this in the next version.
I am not sure what other meaning "Disable Flash on youtube" may have, so I thought this was unambiguous until now. What did you think it meant?
An option for disabling the annotations will be added in the next update (https://github.com/klemens/ff-youtube-all-html5/issues/21). If you have a youtube account, you can also disable annotations in your personal settings.

I would recommend you contact me via email for further discussion, because the review system here is very limited.

thanks very much Rated 5 out of 5 stars

good it fix my error script stopped responding for you tube :)

This review is for a previous version of the add-on (3.0.1). 

Great Addon Rated 5 out of 5 stars

Really nice - works perfect and saves a lot of time

This review is for a previous version of the add-on (3.0.1). 

Nice Add-On. This is Add-on not plugin id***s Rated 5 out of 5 stars

Nice Add-On.
@DarylWise1 this is Add-On!! Plugin is Flash Player, Quick Time plugin, Real Player... Plugin is installed from installer from QuickTime, RealPlayer and other software. This is difference noobs.

This review is for a previous version of the add-on (3.0.1).  This user has a previous review of this add-on.