thanks for this wonderful addon Rated 5 out of 5 stars

This add-on is a life saver, able to download F-HD video,No charge No BS, easy to use works great, just download the FFmpeg (extract it), browse and point to the bin folder within this add-on option window, the add-on will do the rest, just 1 click it will download both F-HD video and sound then merge them to 1 file, couldn't be easier, currently using FF38.01 has no problem at all, it give option to save as or save to default folder within the button menu, customizable quick menu and full menu all so convenience and thoughtful, thank you very much for this great add-on

Rated 5 out of 5 stars

Wonderful addon!! Works great with barely a hiccup. Every once in a while, the audio stream of a DASH video, downloads so slowly, that CYS doesn't automatically mux them. Wish there was an option to mux local files, in this rare case. Otherwise, great job by developer!

Rare indeed, the audio file is usually the smaller file and always downloads first. The next time this occurs, please send us a link so we can investigate. Muxing local files is a feature we can add in a future update.

Thanks for the 5 star review :)

Works But.... Rated 3 out of 5 stars

It works but every so often, regularly, it just spins trying to pull the menu. Once it gets like this the browser as a whole has to be closed and re-opened.

It otherwise does what it says.

The next update should fix this issue. If it does not, please contact us at so you can help us troubleshoot this problem. Thanks

a very good addon a few more options would make it great one Rated 4 out of 5 stars

wow a great idea (using ffmpeg to add full 480 and 1080 support).
I love your addon works great on youtube, the only reason for 4/5 is that it does not work with other video hosting sites :(
the only reason I keep flashgot is it's media detector (I don't use download managers).
If you could make this addon detect all embedded video's it would be 5/5. Flashgot is gpl can't you borrow flashgot's media detector?

ps. you wrote the reason you can't detect embedded video's is performance degradation, flashgot detects embedded youtube video's and I've never noticed a performance degradation.
As I don't use a download manager I would really like to replace flashgot with complete-youtube-saver but atm that's not possible

We have already begun work on downloading embedded YT videos on non-YouTube sites. Downloading videos from any site is something we would definitely like to do but requires a lot of work. Using Flashgot is an option we will have to look into. Stayed tuned.

Thanks for your review!

Simply the BEST 1080p video download add on for Firefox Rated 5 out of 5 stars

This is the best! Finally, a 1080p video download solution without ads or surprise fees.

Setup was easy since I already have FFmpeg on my system. It's great that the add on works fine with both 32-bit and 64-bit FFmpeg.

My first test clicking the down triangle to see all the formats took quite a while but it worked. The second test brought up the detailed info quickly.

Wow, what a lot of formats! This add on is really incredible. I can finally stop running Jdownloader2 to get 1080p vids. Goodbye Java. :)

One small quirk: when I entered Customize to move the Complete YouTube Saver icon where I wanted, it wouldn't move. I also couldn't move it from the URL bar area to the pool of unused icons. My work around was to leave the icon alone and move the URL and Search fields around it. Now the icon is to the right of those fields like I wanted it.

Fantastic add on, if I could give 6 stars I would!

Reviewed: Complete YouTube Saver 5.6.26 on FF39.0 on Win7-64

UPDATE: thanks for your testing on the icon movement and fast reply. I retested and the icon moves fine now. I've restarted FF many times since so I guess it's not moving initially was an issue with my FF setup and not Complete YouTube Saver. Great add on, great support, thank you!

Thanks for the great review!

We tested this on FF 39.0 and had no trouble moving the icon. Please contact us at so that we can troubleshoot this issue.

Not always working Rated 4 out of 5 stars

On some videos, like:
It loads randomly (sometime just spinning infinitely until settings opened).
Also it couldn't load info from page such as Author(channel name), Upload Date etc.

Bugtracker would be appreciated. (You could make a bugtracker on Github w/o code deployment)

This user has a previous review of this add-on.

"couldn't load info from page such as Author(channel name), Upload Date etc"

-Please install the latest version of CYS (v5.6.26), this should fix the problem (file naming). Also, if the throbber stops spinning and the list appears eventually, you might have a slow connection. Please contact us at, and let us know what OS, browser version and CYS version you are using. You can also create a new issue at Thanks for your review!

Nice--feature request Rated 4 out of 5 stars

Works nicely.

Can there be an option so that when I select the menu item, it automatically downloads to default folder--no need to select another submenu again?

This would be much simpler. 1 click + 1 menu selection.

Best yet,

is if it can do a 1-click quick download:
- automatically download highest resolution mp4/best audio + default folder.

So just 1-click and all is done.

CYS can download menu items to the default folder automatically with the following settings:

1.Go to Options> Menu Actions tab
2.Set "On Drop-down Menu Click" to "Save to Default Folder"

The "1 click quick download" feature is a good idea, we will consider it. Thanks for your review!

Works like a charm Rated 5 out of 5 stars

Works like a charm, just download the latest version from the link in the description. Thanks, I can download 1080p now!

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

Thanks for the 5 stars!

Rated 5 out of 5 stars

Really very nice and stable youtube video downloader. Love it :)

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

Thanks for the kind words, glad you like the add-on :)

Rated 5 out of 5 stars

A lot of options and customisation. Other video downloaders feel too simplistic and basic, and can be quite intrusive by putting their buttons on the webpage. This can be as easy to complex to use as you like.

I do have one request, though. Would it be possible to download a mute video? I use a forum where you can upload mute webms only, audio ones won't upload, and I'd like an easy way to get YT videos in an uploadable format.

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

Currently there is no official way to download a mute webm video. However for DASH files, if you play the video before the files are muxed, you will get separate video and audio files. Make sure to enable "Open target folder when downloading" in Options>Download tab. Hope this helps, thanks for the review!!

5.6.17 Very good overall Rated 5 out of 5 stars

Great add-on. Many more options than most of the others I've tried, and for this reason it was a little daunting at first. But well worth the time to learn how to use it. Can download and convert to an impressive number of formats.

I've only had one issue. For high quality MP4s it's supposed to merge audio and video after the download's complete, but it's not working for some reason (5.6.17). I'm using XP (no .NET) with "Hide console window" unticked per the instructions, and a recent version of ffmpeg, so not sure what the problem is.

Would recommend as first choice.


I was using FF31 so updated to FF36 and it's working great now. I think part of the problem was my own fault. Sometimes after the download starts I close the browser and just watch the download window. I've got it set to close the download window automatically when the download completes, so after the download finishes and the window closes, the FF process quits and CYS can't run. Duh!

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

Thanks for the 5 star review!!!

Sorry to hear you are having a problem with CYS. We did receive your email and will be contacting you shortly. BTW, with v5.6.17, you no longer have to unhide the console window in WinXP; ffmpeg should work just fine without .NET framework.

Rated 4 out of 5 stars

A great 'must have', and works fine. (V5.6.3) The only thing I miss it: The possibility of download of the originally uploaded video or the audio track only in its real! format. The application is certainly "knows" that what is stored on Youtube. Why CYS don't tells me? Or if this is in the download menu, how can I choose which is the original? I don't want any conversion! Therefore I rate this 4 and a half star.

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

Thanks for your review! Version 5.6.3 is no longer working properly. For critical fixes, please download the latest version (v5.6.14) here:

CYS saves AAC/M4A/OGG/OPUS audio tracks without transcoding, i.e. without any quality loss. CYS only transcodes audio to MP3 (and WAV). Hope this helps, please contact us at if you have any other questions, thanks.

Very recommended Rated 5 out of 5 stars

Very good, finally I can download 480p and 1080p videos WITH sound, which I couldn't with flashGot...

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

Thanks for the 5 star review!!

Rated 5 out of 5 stars

Excellent add-on! Just fix the new problem so everything can return back to normal! :)

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

Fixed!! Download version 5.6.8 here:

Thanks for your support!!!

v5.6.3 - It works great with PaleMoon25, thanks Rated 5 out of 5 stars

Download 1080p mp4 & webm (H264 & VP9) perfect, but I found 2 small errors:
- It don't found 4K
- It saves 2 audios in a video (in mp4 and in webm)

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

The missing 4k format is Fmt 266. We added this in CYS v5.6.6.1. You can download it here:

If you have any trouble, let us know and we will email it to you.
Thanks for your review!!!

DownThemAll support? Rated 5 out of 5 stars

Really great add-on. Easy to choose what to download and muxes for me!

Have you thought of adding support for the DownThemAll add-on? YouTube videos download much faster with a download accelerator.

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

Thanks for the 5 star review!! Here's the problem with DownThemAll and other accelerators. After downloading the separate audio and video streams (DASH formats), DTA would not be able to mux them together. Nor could it be used when extracting/converting audio formats. DTA can not be used for any FFmpeg operations. What we would like to do is add built in mutli thread download capabilities to CYS. Look out for this in the future.

please add support to download youtube 60fps video Rated 5 out of 5 stars

4kvideodownloader able to download 60fps youtube video. but they can't download vp9

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

60fps formats were already added back in Nov:

h.264 720p 60fps = fmt298
h.264 1080p 60fps = fmt299

vp9 720p 60fps = fmt302
vp9 1080p 60fps = fmt303

The latest version of CYS is v5.6.6.1. It can also download Fmt 266. You can find it here:
If you have any trouble, let us know and we will email it to you.

And we haven't forgotten about your request for subtitle downloads is coming.

Hope that you will add that one extra missing star :) Thanks for your review.

Excellent, time-saving download extension Rated 5 out of 5 stars

Love the DASH auto-muxing. The extension works great on YT. There are some minor glitches with Pale Moon, hope this gets fixed.

I'd also love to see it working outside of YouTube, so I can get rid of my other download extension. Also wonder if it's possible for it to *auto*-update to the latest version, since AMO takes so long.

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

We are looking into Pale Moon issues as we speak. If you haven't done so already, please contact us at our support email or create a new issue at and let us know about the specific problems you are having.

Downloading videos outside of YT is in the works as well as different Auto updating options. For now you can find the latest version at

Thank you for the 5 five star review!!

Rated 5 out of 5 stars

Downloaded an ultra-HD YouTube video with no problems. Awesome! Make sure you get the 5.6.3 or later.

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

Good to know CYS is working well for you! Thanks for the 5 star review!!!

Rated 4 out of 5 stars

Nice (at least ver. 5.5.3., the version i got here didn't work)!
Exactly what I needed, finally: To download the highest aivailable quality audio and then convert it to mp3 or ogg. In one click, so i don't have that hassle to manually download in mp4, convert it, delete the mp4 file.
An option for id3 tags would be nice though.

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

Please contact us at with your ideas for feature requests. Thanks for the review!