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...

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

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.

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

YouTube Center contains all kind of different useful functions which makes your visit on YouTube much more entertaining.

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

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...

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.

Turn the lights out for easier watching of YouTube videos!

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...

Replace http:// with https:// in the address bar, to make sure you're using the SSL-encrypted version of a page. Only enable for pages that you know are SSL enabled.

Automatically adds embedded videos after links to pages like: glumbert, metacafe, google, yahoo, photobucket, youtube, myspace...(and many others) so you can view the video without opening a new page.

Adds a lyrics box to the YouTube sidebar under the video informations box. It can search in eleven different lyrics sites and it shows also all the results in a drop down.

Watch videos from video sharing web sites without Flash Player. You can view the videos with a classic video plugin or with HTML5's video player. A download option is also available.

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

Makes Youtube's "Watch" page (video page) better with a variety of features and options including a right-side description, older video players, style improvements, and much more.

Enlarge thumbnails & profile icons on mouse hover. Display pictures in comments directly. Download albums quickly. 滑鼠移入縮圖或個人檔案圖示時放大圖片，直接顯示留言內的圖片連結，快速下載相簿內的圖片。

Cross-links movie sites so you don't have to.

Adds video titles, shows previews and embeds on click. Also supported: Vimeo, LiveLeak, WorldStarHipHop, Nicovideo

A lightweight and non-intrusive userscript that control autoplaying and set the preferred player size and playback quality on YouTube.

The BEST plugin to automatically loop (repeat) YouTube videos - Full, or just a part of it, with loads of other features! Works seamlessly with Firefox 3.6.* and above, and Chrome as well ! Beware of cheap copies. :) *** SUPPORTS HTML5 VIDEOS,...

电视墙-2

Adds links below the Youtube video to (a) download the video (HD .mp4 file, no converters are used, no external sites) (b) view the video with an embedded external player (like mplayer, totem, or vlc plugins)

Stops YouTube videos from autoplaying if other videos are already running. Additionally, when you play a video, it stops any other running video, so YOU don't have to. :)

Adds a sidebar with search results from Dictionary.com, Wikipedia, Flickr, and Youtube. Please report any bugs.

Gets the old order of subscriptions on the YouTube start page back.

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.

PERFECT YOUTUBE LAYOUT. Auto scale video size acc window size to get largest video. Video allways visible even scrolling. All content moves on sidebar and it can be auto hide/show. See screenshots inside...

auto-embeds the video file, enlarges it, and provides a link to download the video. supports 57 websites (incl. embed-disabled youtube videos). auto-checks for updates to the script weekly.