Rated 2 out of 5 stars

This is no longer working! Please update.

Need YouTube Flash Video Player in order to use at the moment. Rated 4 out of 5 stars

Youtube has forced html5 as the default player. Add this plugin along with https://addons.mozilla.org/en-US/firefox/addon/youtube-flash-player/?src=search

to fix the problem.

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

Rated 2 out of 5 stars

Doesn't work for me when I use the &html5=1 url parameter to force HTML5 video.

Inferior alternative available Rated 1 out of 5 stars

Seeing as this hasn't worked in ages, people might want to try YouTube High definition. Doesn't do anything for prebuffering but at least it fixes quality of videos and screen size. If anyone knows of other alternatives, please post.

Emailed the author for support, but nothing's happened for ages. Please fix and rating will be updated.

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

Autoplay on playlists fix needed Rated 5 out of 5 stars

smart video for youtube is breaking autoplay on playlists sometimes have to click on the big play button to go to the next video.

This user has 2 previous reviews of this add-on.

No longer working for me. Rated 1 out of 5 stars

This extension wuz working great until a few months ago. I'm guessing YouTube changed something.

Rated 3 out of 5 stars

doesn't work with Firefox 38.0, please fix it!

Rated 1 out of 5 stars

It does not work at all.

A shame... Rated 3 out of 5 stars

I would give you 10000 stars! I f it wasn't so buggy... Makes it almost useless! I'm going to give it one more chance because if they correct those issues, it will be an awesome addon! But right now, it freezes and crashes A LOT and it's really annoying...

Rated 1 out of 5 stars

Не работает

Broken and buggy as hell... Rated 1 out of 5 stars

This Add-On has been super buggy for months if not years. Usually I don't write reviews, but this add-on has caused me so much trouble... it was just screaming for a negative review.

Pleased Rated 5 out of 5 stars

This did what I wanted it to do: allow me to pre-buffer videos as I like to bounce around videos and with DASH that means constant loading for me with my ~2MB connection.

I had to switch from 480p to 720p though as the former isn't offered with DASH disabled.

My main criticisms are:
- It takes a while to load after the page loads, so the video starts buffering, then SmartVideo loads and the buffering starts all over again.
- It requires two clicks rather than the usual one to get to the settings screen from the Firefox addons page.
- I'm starting to get the feeling that this addon is no longer supported.

Rated 1 out of 5 stars

Stopped working

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

Needs an update Rated 4 out of 5 stars

Firefox seems to be updating constantly and with these updates, I'm sure it has been effecting addons. SmartVideo is a wonderful addon, but since the last Firefox update, it seems to work *most* of the time. It used to work all the time, but I've been noticing it working slightly less often than it used to.

Other than this problem, this addon is fantastic. I live in an area where the internet is rather slow, so I can have it automatically set my videos to 240 and auto pause. I get my news from youtube, so I often open up multiple tabs of videos, so this is quite handy.

I see that one user complained about the popup at the bottom. I'm pretty sure there is a setting to remove it.

I love the capabilities of this addon, but it needs an update... Rated 3 out of 5 stars

When this addon works properly, it works well, but recently it's been causing errors with youtube videos, especially when you go to many youtube videos in a row in the same tab. Or sometimes the youtube video stops for no reason mid-way and says there was an error that had occurred and I have to refresh the tab to get back functionality.

annoying pop up screen below video Rated 1 out of 5 stars

the pop up screen below the video is annoying, made me uninstall this

Unbeliveable Rated 5 out of 5 stars

I have ran into absolutely no problems with this addon. it works exactly as advertised. better than anything else iv tried. i don't know how there are so manny negative reviews for this. iv tried many MANY thing that have been too confusing. made the buffer problem WORSE or downright didn't work at all. for three days i had been trying to watch one single video and only ever got a few minutes in at the best of times. something went horribly wrong with the way youtube was buffering videos recently and my face was going red over it. but this is the only thing that's worked for me. and its worked better than i ever could've asked it to

Inconsistent and broken. Hurts more than it helps, frequently. Rated 3 out of 5 stars

I'll be generous in considering that the developer of this add-on has to be very aware of frequent updates to Youtube and HTML embedded videos and make updates to the add-on in tandem. What I cannot be generous about, however, is how the add-on works in normal operation. So consider this, perhaps, an update on the status of the add-on as of the date of this review listed above.

For one, the percentage buffered on the video is set to 42%, which I can agree is probably an average amount of required buffering of the video meant to guarantee a seamless viewing experience. The Smart Buffer feature, as it's described in the UI, presumably allows for the add-on itself to determine at what percentage buffering should stop. I can't tell whether the SmartBuffer intends to change the percentage and make it visible for the user, or if it simply fixes the percentage and forbids you to change it. It seems to work differently between the web page and pop-up that both control the preferences. For that matter, they don't seem to work together, or be aware of one another, which I would see as a design fault, rather than a bug. I use this issue not as a primary complaint, but as an example of how the add-on fails to account for corner cases in frustrating ways.

It doesn't seem to handle ads very well. I would recommend using Adblock while running this add-on on Youtube videos, because without Adblock running, I can't tell whether the add-on wants to try to skip ads on its own accord, or let the ad play, while failing to load it. Ads have been playing at the beginning of Youtube videos for a long while now; I cannot imagine how this add-on hasn't accounted for them to date, or, if it does, why it seems to take so long to handle them.

My biggest complaint may be a bug, but again, it's one that should have been fixed a while ago, and is the main reason I downloaded this add-on: Youtube will autobuffer to a certain percentage ahead of your place in your video when you pause, and this add-on is meant to prevent that from happening. I have a pretty unstable Internet connection where I normally watch Youtube videos, so this add-on would have worked wonders for me if I could pause the video, wait a bit for the full video to buffer, and then continue watching.

The add-on does not buffer the full video. At the very least, it doesn't do it consistently, because I have had videos that perform this function quite usefully, but other times, the video will buffer as standard, notify that it is done buffering at my 100% preference, and the 20 minute video I had waited to watch was only buffered by about a minute.

The fact that the preferences page can break the Firefox window, preventing so much as scrolling or tabbing, was the straw that broke this weary camel's back. Consider contacting the developer to let them know about these issues. I will be sure to, as well, because if these problems aren't fixed, I couldn't recommend this add-on to anyone, and I definitely can't recommend it at this point.

Rated 1 out of 5 stars

Doesn't work terribly well. It fixes the loading, but for some insane reason does not allow 1080p videos. WTF? Fix it now.

WARNING: This injects unwanted HTML/JS code in random pages Rated 1 out of 5 stars

This used to work, but is now completely broken. What is worse is that the add-on injects unwanted HTML/JS code that should only be injected in YouTube pages. If you're writing a blog post or composing an HTML document or creating a web page, you will find that unknowingly to you, this add-on has inserted a bunch of code into the HTML of your blog post. Nothing is shown in WYSIWYG but switch to HTML and be shocked. The developer has been notified of this, but they have not responded or taken action. Disappointing.