Executing a Script/CSS
Chrome extension like greasemonkey (Beta testing)
Not using background/event page.
Low memory consumption.
Not supported script update.
http://wiki.greasespot.net/Greasemonkey_Manual:API
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user.js
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Supported API:
GM_xmlhttpRequest
GM_addStyle
GM_getValue
GM_setValue
GM_listValues
GM_deleteValue
GM_log
GM_openInTab
Metadata
@name
@include
@exclude
@run-at