Userscripts.org

Removes ads and unwanted sections (configurable), allows downloading and resizing videos, changes the default video quality, expands the description and the video size, can prevent autoplay and autobuffering, etc...

Download Link + Quality Selector + Rollover Preview + Media Controller + Media Resizer + More...

The best YouTube script. I know it, and you know it.

Download videos from YouTube. Simple, lightweight and supports all formats, including WebM.

Buffers the video without autoplaying and puts it in hd if the option is on

Removes ads and unwanted sections (configurable), allows downloading and resizing videos, changes the default video quality, expands the description and the video size, can prevent autoplay and autobuffering, etc...

A cross-browser script that adds a button to download YouTube videos as MP4 and FLV files. This script downloads the videos directly from YouTube and it integrates with YouTube's interface.

Removes ads and unwanted sections (configurable), allows downloading and resizing videos, changes the default video quality, expands the description and the video size, can prevent autoplay and autobuffering, etc...

Perfect package to enjoy HD videos in YouTube. Always watching or downloading the highest quality format ( 4K / HD 1080p / HD 720p / HQ FLV / MP4 iPod ). Add download icons in video list page.

FreeTube débride les vidéos Youtube pour ne plus qu'elles galèrent leur race quand on est chez Free ;) Lisez bien le paragraphe "Informations sur FreeTube" plus bas pour en connaitre toutes les fonctionnalités !

No autoplay; buttons to play HD/HQ with MP4 or Flash plugin; download. Compatible with Firefox/Safari/Opera/Chrome/others, translated into English/Spanish/German/French/Italian.

Automatically plays the best quality YouTube video format and removes ads, plus several other optional features

Download the full movie trailers from apple.com with this userscript.

Automatically Scale YouTube ect.. to Largest Possible Size & HQ/HD Quality Video. Scroll down to read comments without missing video, more...

Adds FLV, MP4, 3GP, and 720p download links to YouTube.

Adds a link to download video,video information and a button to watch video. You can watch a video in list pages. ダウンロード用のリンクとビデオ情報を追加します。リストページでビデオを見ることができます。

Automatically plays the best quality YouTube video format and removes ads, plus several optional features

Replace standard YouTube player with latest JW Player.

Download Youtube Videos (HD 1080p & 720p/HQ MP4, Mp3, FLV, 3GP) Dailymotion (HQ MP4, FLV), Magavideo (HD/HQ FLV) Google (HQ MP4, FLV), Vimeo (HQ MP4) Break (HQ MP4, FLV), Veoh (HQ MP4, FLV), Metacafe, Spike, Myspace, Facebook, Current, Redtube and...

Resizes the video to a nice and comfortable size unlike other resizers. Autoscrolls to the player and also hides youtube guide and puts the title on top centred. WORKS WITH THE NEW LAYOUT!! (1/2/2012) with 21/3/2013 FIX

Adds a link to download video and a button to watch a video. You can watch a video in list pages. ダウンロード用のリンクとビデオ情報を追加します。リストページでビデオを見ることができます。

Optimizes YouTube for bigger resolutions and gives you the opportunity to hide various sections of the video playback page, disable autoplay, enable HD and download videos. All this and more can be utilized through a built-in configuration menu:

Runs on every page and replaces embedded youtube videos with the video set to the highest possible quality

Replaces the default YouTube player with Flowplayer (flowplayer.org). Forked from version 1.2 of Youtube Alternate Video Player by Yansky.

No autoplay; buttons to play HD/HQ with MP4 or Flash plugin; download; visit the original page. Works for any site, detecting most YouTube embedded videos.

Simply adds a link to the fmt=22 version of a video. (Screenshot included)

Makes YouTube videos large. As well as rearranges the terrible new YouTube layout into an elegant layout that has great functionality and I've added a nice lights-out feature to darken the outside screen to give you more focus on the video. Enjoy!...

Automatically select the playback quality for Youtube videos. Defaults to 1080p, but can also be changed if needed.

Adds &fmt=18 to the url for high quality but not if any &fmt=x already exist and adds &fmt=18 to all the links

Watch videos in high quality automatically. Now has a UserScript command to toggle a confirmation box. Made for people who don't login or save cookies. Uses JavaScript instead of &fmt=18; no reloading pages