Userscripts.org

Permanently enable HTML5 on YouTube.

Adds a button for favoriting YouTube videos.

youtube preview for wakaba

Embeds the Yahoo! WebPlayer into each site

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。

Adds functionality to the Google web search. Main features include Multisearch, Image & Video results with a Player, Wikipedia definitions and links, and some clutter cleanup. All options can be turned off.

Flash 動画プレーヤーの選択状態を維持しないことで、キーボードによるページ操作（移動等）を妨害しません。 ニコニコ動画, YouTube に対応。

Let's you convert Youtube videos straight from youtube. A new button would appear an the bottom left of every movie clip in Youtube - just click it and the mp3 is on the way to your compuer

Delete comments below +2 votes

Clicks the 'like' button for you

Focuses the search form on Youtube pages.

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

Lets you download YouTube clips by adding a "Download" button to the ratings bar. FYI, it downloads the highest-quality video possible (which may be against your wishes).

Removes the annoying 'Set Facebook as your homepage' popup!

Opens the video in youtube-mp3.org in a new tab so that it can be downloaded in mp3 format. Download link appears above video, to the right of the search bar.

For those who dislike/hate the new minimalistic YouTube player, you can watch all your videos in the older player introduced in 2010.

Create a new link for each Youtube video by appending the title to the URL.

Prevents YouTube's Character Counter from Becoming Active through the Tab Key

Fügt unter jedem Youtube-Video einen Download-Button hinzu!*

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).

Removes the annoying tracking parameter called "feature" from links on YouTube. (&feature=related and ~25 others) All your YouTube links will follow the same pattern. No unnecessary information in URLs.

Disable comments from YouTube per default, with an option to (temporarily) display them for a single video.

Resizes the YouTube player's height so you can get a better listening experience with music on YouTube.

Replaces http with https in YouTube URLs.

Creates a button which expands The flash player to fill your screen. Works on YouTube, Viddler, Dailymotion, Blip.tv.

remove seen videos on new STUPID YouTube homepage layout

Schnell navigieren in der Zeitleiste.

Adds a link to play videos from YouTube in XBMC

Allows you to use customizable seek times to skip intros on a series or anything you might need

Play selected videos one after another in series. Make up your own auto-playlists from any Youtube videos. This script requires another script called, "Middle-click multi-selected." Install this other script in Grease Monkey and then this script...