Content Script Injection
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Since Greasemonkey 2.0, scripts which specify
@grant none simply execute in the content page scope.
Reading and writing values and calling functions works transparently for interacting with that content scope.
For scripts which
@grant any privileged APIs, these methods are provided in a privileged scope which is intentionally isolated from the content page.
The same functionality is available by calling
window.eval() to explicitly target the content window scope for execution.
(Note that a bare
eval() executes in the script scope.)
// ==UserScript== // @name Content Script Example, grant none // @grant none // ==/UserScript== // Because I am a "@grant none" script, I operate right in the content scope. // I can call functions defined by the page with no problems. var result = functionFromContentScope(); // Similarly, I can export values or functions to that scope for it to call. window.someVariable = 'someValue';
// ==UserScript== // @name Content Script Example, privileged grant // @grant GM_log // ==/UserScript== // Because I am *not* a "@grant none" script, I operate in my own private, // privileged scope. I can call functions defined by the page only by // explicitly referencing the window: var result = window.eval('functionFromContentScope();') // Similarly, I can export values or functions to that scope for it to call. window.eval("window.someVariable = 'someValue';");