This extension (add-on) prevents YouTube from displaying annotations provided by publishers. Basically the annotation button is disabled once the player is loaded. You can simply turn it on if you wish.
Note that annotations are being turned off once the player is loaded in a new tab/window.
This extension works for both HTML5 and Flash players.
For bug reports and FAQs regarding this extension please visit:
http://add0n.com/youtube-tools.html
谷歌浏览器、其他Chromium内核的浏览器
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