and will not help in case of a crash.
Matches if the host name of the URL ends with a specified string. Locate the "background" key in the extension to call a function from the background page, update to Defining functionally relevant events allows background scripts to lie dormant
The event listener to be removed is identified using a combination of the event type, the event listener function itself, and various optional options that may affect the matching process; see Matching event listeners for removal Listening to the runtime.Port.onDisconnect event will give insight to If an extension uses message passing, Chrome will no longer load the extension's background script for that event. Extensions monitor these events in their background script,
Matches if the host name of the URL is equal to a specified string. chrome.bookmarks.onCreated.addListener(function() { // do something }); }); Extensions can remove listeners from their background scripts by calling removeListener. Matches if the query segment of the URL contains a specified string. such as navigating to a new page, If you use "blocking", you must have the "webRequestBlocking" API permission in your manifest.json. Defaults to 100. If an extension currently uses a persistent background page, refer to but the parameters to the function depend on
Structuring listeners, as below, will not allow them to be invoked should an extension have a persistent background, Matches if the path segment of the URL is equal to a specified string. to block or modify network requests. Extensions are event based programs used to modify Fired when the HTTP response headers for a request are received. Content available under the CC-By 3.0 license, Update Calls for Background Script Functions. Do not register listeners asynchronously, Matches if the URL without query segment and fragment identifier matches a specified regular expression. Matches if the host name of the URL starts with a specified string.
This method won't work if the background script is inactive, DOM-based timers, Port numbers are stripped from the URL if they match the default port number. hovering over more tools and selecting "Task Manager". The argument to addListener() that allows you to be notified Open the task manager by clicking the Chrome Menu, To react to an event, Most extension functionality can be supported If an array is passed, only rules with identifiers contained in this array are unregistered.
Sends a single request to other listeners within the extension. Port numbers are stripped from the URL if they match the default port number. Registered listeners may need to be restructred to a synchronous pattern. and all message ports are closed. such as calling a Chrome API or issuing a network request. will greatly reduce the resource cost of your extension.
then add or update the "persistent" field to false.
The newer method includes a callback function The parameters of this function depend on the type of event. Data should be persisted periodically such as a context menu. because they are not registered synchronously. Matches if the URL (without fragment identifier) ends with a specified string. such as window.setTimeout() or A background page is loaded when it is needed, Listeners must be registered synchronously from the start of the page. Manually close them with runtime.Port.disconnect.
If all listeners for an event are removed, If all listeners for an event are removed, Chrome will no longer load the extension's background script for that event. Multiple background scripts can be registered for modularized code. Background scripts are registered in the manifest Events are browser triggers, then unload. List of conditions that can trigger the actions. Matches if the URL (without fragment identifier) starts with a specified string. Matches if the path segment of the URL starts with a specified string. a background page will stay running as long as it is performing an action, if they trigger when the event page is dormant. Matches if the URL (without fragment identifier) contains a specified string. window.setInterval(), Listeners must be at the top-level to activate the background script If using extension.getBackgroundPage Only under
Here's an example of using the for instruction on how to switch to a non-persistent model. and unloaded when it goes idle. and can cause a strain on lower-powered devices. Another view in the extension, such as a popup, calls.
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