Userscripts.org

Why does YouTube not let us see where we've been? This script is a "must have" to see which videos you have already viewed. Highlight previously visited video links on YouTube.

Removes the advertisment, top(navbar), and bottom(social networking) bar of the RuneScape game page. This works for all display modes (fixed, resizeable, and fullscreen).

Autoscrolls Youtube player to top and resize the video to a nice and confortable size unlike other resizers. WORKS WITH THE NEW LAYOUT!! (21/5/2012)

Adds an inline, customisable Lyrics screen to YouTube Music videos and channels. Multiple sources and a manual search form ensure that the Lyrics are always provided. Firefox & Chrome

Control autoplaying and playback quality on YouTube.

Brings the inbox overview back to the home page

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

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

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.

Scrobbles the currently watching YouTube video to Last.fm manually and automatically.

Turns plaintext YouTube URLs into embedded objects

Turns YouTube URLs into embedded objects (4chan, 4chon.net, 420chan, archives)

Hides videos of users you never want to see on youtube. This will store a sorted list of users in your about:config prefs file, and will remove their videos from searches and the recommended videos sidebar.

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。

Dowload button, repeat button, shortcuts, auto selection of resolution etc.

Enhances YouTube's HTML5 player. Some features: additional keyboard shortcuts (including navigation); fix player bugs; control autoplay and auto fullscreen; informational text overlay on video. Customizable (except for the key shortcuts).

Displays the ratio of likes to dislikes on YouTube videos. Tested on Chrome and Firefox.

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

Download YouTube videos with a single click of a button! Works on Google Chrome, Firefox, and Opera.

A common troll that replaces most things on your browser to some type of troll! This script is good to be used as a prank on a friend or if you are in school or at work and you don't want to work then you just point out that your computer "isn't ...

Use Meme emoticons like rage guy, troll face, in Facebook, Twitter, Google+, YouTube ,Cuanto Cabron & more this script periodically updated. We welcome suggestions for new memes Usa emoticonos de memes como trolldad pokerface en Facebook Twitte...

Add a toggle button for showing/hiding playlist bar that appears at the bottom of youtube pages that have urls containing "list".

Some tools for Youtube

Solo para la calidad 480p para ver en YouTube asi sea en pantalla completa By CesarChris710

Adds menu (bottom right) with download links for available video formats. Works with Javascript disabled (NoScript).

YouTube shows playlists in an odd order by default, starting off with the playlist last selected. This happens everytime you click "Add to" (adding a new video to your playlist), or in your profile (to see your playlists in the header). Time for a...

On Youtube: Adds a button to open the search in a new tab.

Master Scripts eXecute scheduler. for Chrome18.0　Iron17.0　Coolnovo2.0.2.26　Safari5.0.5　Opera11.61　Firefox3.6.26　Lunascape6.6.0　SeaMonkey2.7.2

Enhances your pirating experience by adding torrent links to iMDB, Rotten Tomatoes and MovieFone.