Rated 4 out of 5 stars

Works well;does the job but it may slowly use up or eat RAM if left enabled.

I've disabled this add-in for now, until I need it again, and Firefox RAM usage is around 200 to 300k instead of going up to over a gigabyte.

Vimeo 1 - MP4 YouTube Downloader 0 Rated 1 out of 5 stars

No funciona en Vimeo

Rated 1 out of 5 stars

Doesn't working

Cannot download to folders Rated 3 out of 5 stars

From 36.0 update, downloads does not start if download location is configured "Save videos in" or "Firefox's default download location". "Always ask" still works fine.

Update for version 1.3.3.1
no improvement.

Rated 3 out of 5 stars

A right-click-on-video-link downloader is exactly what I'd been hoping for for years, and this addon would be fantastic if it worked at least most of the time. Unfortunately, it only seems to work on maybe 20% of the links at YouTube whenever I try to download videos. (As has been mentioned elsewhere below, most of the videos it ends up "downloading" complete instantly with a file size of 0.) But I always try it first, because I hate YouTube's auto-play/load and prefer to avoid it if possible. I usually end up using the Download YouTube Videos as MP4 addon button though, because it works every single time. Flash Video Downloader - YouTube Full HD Download is another good one that I usually use for sites other than YouTube. (I have five video downloader addons, and have used others as well.)

01/Mar/'15 UPDATE:
It seems the right-click menu option hasn't been working at all for the past week or so. (Fortunately, my main downloading addon mentioned above is still working just fine.) The videos I've tried downloading with this addon recently, unlike in previous cases where the file immediately showed completion at "0", now don't even seem to get to the point where it shows a completion of 0. I attempt the download, and then nothing happens at all, even though my browser lists the download, thus confirming that a command has executed...

Rated 5 out of 5 stars

Update:
It seems like Youtube has broken this and other downloaders. I get a lot of 0 byte downloads lately.
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Wow, just what I have been looking for. No other Youtube downloader can allow you to download from embedded videos on other sites without going to Youtube first. This one can! It even has a setting to find HD videos if available. Kudos!

Firefox 29.0.1, Windows 8.1 x64 Rated 2 out of 5 stars

Нет ссылок на скачивание в результатах поиска, в плейлистах, нет списка ссылок на различные форматы и разрешения на странице Youtube-видео.

Rated 5 out of 5 stars

Working great. It's like a shining day here

Worked on the First Attempt Rated 5 out of 5 stars

I tried this video add-on for the first time today, so admittedly my experience with it is very limited. I wanted to download a few videos from an author's website, rather than logging on to YouTube itself. Further, I wanted to obtain the hi-def versions of these videos, rather than YouTube's default resolution.

You must have Adobe Flash Video installed in your browser to view most on-line videos. In my experience, it does not cache .flv files to your hard drive, so you cannot watch a video and then retrieve it from your browser cache, because it isn't there (I am thinking of VideoCacheView, for example). Most of the other YouTube downloaders I've tried have given me mixed results, usually deficient in one way or another.

There are three things I love about this add-on:

1. It actually does download YouTube videos to your hard drive with no "jumping through hoops."
2. You can set an option so that it downloads hi-def by default (if available).
3. It inserts a button on the web page you're visiting beneath each video on that page - even web pages that merely *link* to YouTube videos - that you can click to start the download to your hard drive.

Additionally, it automatically converts the Flash format (.flv) to mp4, which makes it easier to watch the downloaded video whether you're using a desktop or a tablet or whatever. If you were to combine this download helper with a video-conversion app, you could port the videos to any platform.

I highly recommend it.

Version 1.3.3 beta 3 Rated 3 out of 5 stars

I installed the latest beta version at https://addons.mozilla.org/firefox/downloads/file/181616/mp4_youtube_downloader-1.3.3b3-fx+sm.xpi?src=dp-btn-devchannel. I tested it on 2 vidz already, and they downloaded fine.

August 10th update: It seems to have fizzled out.

August 23rd update: Seems to be working again for most videos.

This review is for a previous version of the add-on (1.3.2.2.1-signed). 

Update Released

Hi John,
I released an update (version 1.3.3) that might fix your problem. If you had the beta version installed, you should automatically receive the update; otherwise, you can install it from: http://jhartz.github.io/mp4downloader/download.html

If you continue to have problems, please contact us directly: http://jhartz.github.io/mp4downloader/contact.html

Thanks,
Jake (MP4 Downloader author)

Does not work on Youtube Rated 1 out of 5 stars

Generates a download button, but the link does nothing.

This review is for a previous version of the add-on (1.3.2.2.1-signed). 

Update Released

Hi Cerin,
I released an update (version 1.3.3) that might fix your problem. It is still in the review queue for Mozilla Add-ons, so it won't be released here for about a month, but if you want to install it right away you can install it from: http://jhartz.github.io/mp4downloader/download.html

If you continue to have problems, please contact us directly: http://jhartz.github.io/mp4downloader/contact.html

Thanks,
Jake (MP4 Downloader author)

Rated 5 out of 5 stars

i like this app It work for me,,, Great addon 10/10...

This review is for a previous version of the add-on (1.3.2.2.1-signed). 

dosen't work with FB now Rated 3 out of 5 stars

not working with Facebook now

This review is for a previous version of the add-on (1.3.2.2.1-signed). 

Rated 5 out of 5 stars

I needed to download a 2h video from dailymotion in mp4 in HQ and this addon was the only one that has been able to do it ! Great addon !!

This review is for a previous version of the add-on (1.3.2.2.1-signed). 

not working on dailymotion Rated 2 out of 5 stars

not working on dailymotion.
New info:
I tried many pages, with same results: shows only archives with 660kb more or less in all pages that I've tried. I also can't see the video downloaded ( 660kb ) shows message of error. This happens since the beginning of december.

This review is for a previous version of the add-on (1.3.2.2.1-signed). 

Please contact us

Hello,
Can you please contact us with more details, including the exact URL of a video that does not download, any error messages that appear, and any other details to help us reproduce the problem? Contact information is on the contact page at http://mp4downloader.mozdev.org/contact (with more details, we can try to fix the problem).
Thanks,
Jake (MP4 Downloader author)

Rated 5 out of 5 stars

Just flat-out works. I love software like this. No excuses, issues, etc. Just works great. (Mac OS X 10.8.2, Firefox 17.0.1)

This review is for a previous version of the add-on (1.3.2.2.1-signed). 

Rated 5 out of 5 stars

I suggest you try YouTube Robot which enables you to download video from YouTube.com onto your PC, convert it to various formats to watch it when you are on the road on mobile devices like mobile phone, iPod, iPhone, ipad, Pocket PC, PSP, PSV or Zune.
youtuberobot.com

This review is for a previous version of the add-on (1.3.2.1-signed). 

Rated 5 out of 5 stars

This is without a doubt the best Firefox add-on period. Not only does it download videos from youtube and other sources on the web. It also converts them to mp4. Mp4 is a much better program to view than flash. I download a lot of youtube videos and this is the best. I have tried others, but none were without issues. I have had this program 3 months and have downloaded at least 50 hours of videos, and no problems. Also it doesnt slow down your system the way real player downloader does.

This review is for a previous version of the add-on (1.3.2.1-signed). 

Rated 5 out of 5 stars

Great app!a great app! it is! This app fulfilled my all needs for you tube and it has many great features. Style to color all I found and tested was wonderful about this app. I want people to use it and to become a happy as I am. So I want a Tablet for this,that's why I shared my experiences with people. AS far as I am concerned I did not want it to be shared because I was felling happy to use it alone, but I did it only for my great tablet. So I want THE Firefox Company to provide me a tablet

This review is for a previous version of the add-on (1.3.2.1-signed). 

Rated 5 out of 5 stars

Works perfectly with most of the video sharing websites. And if the video is from youtube on other websites then it gives a button under the video to download it.

It grabs the video in high quality

This review is for a previous version of the add-on (1.3.2.1-signed).