extension.getBackgroundPage()
Returns the Window of the background page if the background script is running. If the script is not running, null is returned.
This a synchronous function.
Note:
This method cannot be used in Private Browsing mode — it always returns null. Consider using runtime.sendMessage() or runtime.connect(). See Firefox bug 1329304 for more information.
Syntax
js
let page = browser.extension.getBackgroundPage()
Parameters
None.
Return value
object. Window of the background page or null.
Examples
Suppose a background script defines a function foo():
js
// background.js
function foo() {
console.log("I'm defined in background.js");
}
A script running in a popup can call this function directly like this:
js
// popup.js
let page = browser.extension.getBackgroundPage();
page.foo(); // -> "I'm defined in background.js"
Example extensions
Browser compatibility
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Note:
This API is based on Chromium's chrome.extension API. This documentation is derived from extension.json in the Chromium code.