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@grant

@grant is used to whitelist GM_* and GM.* functions, the unsafeWindow object and some powerful window functions.

// @grant GM_setValue
// @grant GM_getValue
// @grant GM.setValue
// @grant GM.getValue
// @grant GM_setClipboard
// @grant unsafeWindow
// @grant window.close
// @grant window.focus
// @grant window.onurlchange

Since closing and focusing tabs is a powerful feature this needs to be added to the @grant statements as well. In case @grant is followed by none the sandbox is disabled. In this mode no GM_* function but the GM_info property will be available.

// @grant none

If no @grant tag is given an empty list is assumed. However this different from using none.