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Menus and Scripting APIs also support persistent data: Here’s more info on background script functions. Use this API anytime you need direct access to a background page that may be suspended or closed. For instance, you may need a background script to run a process while the user is involved with a browser action or side panel. Use `` if you need a background page to run processes unrelated to events.(Note that Firefox recognizes arguments passed to addListener and does not create multiple listeners for the same set of arguments.)

This works with nearly all events in the WebExtensions API. This way, if your background is sleeping Firefox knows to wake the script whenever a new tab is spawned. Event listeners must be added at the top level execution of your script. Use an event listener like `` in your background script.Now that your background script is non-persistent, you need to tell Firefox when to wake up the page if it’s suspended. Here’s more info on background scripts with implementation details. To turn your background into an Event Page, set `persistent: false` on the background page in your manifest.json.

Save on memory resources by putting idle background pages to sleep.

No need for an extension reboot to reset a background page.

Now we can restart a corrupted background page without hindering the user.

Resiliency against unexpected system crashes.

But you can make this change today and use new Event Pages benefits such as: This update is a major step toward MV3 because all extensions must adopt Event Pages in MV3. We enabled Event Pages for MV2 (aka non-persistent background pages that can be closed and respawned based on browser events) in Firefox 106. Event Pages retain several important features, including access to DOM and WebAPIs that are not available with the new service worker backgrounds used in Google Chrome. In Firefox MV3, we’re providing Event Pages as the background script. MV3 changes you can make to your extension right now To this end, we recently released some exciting new features you should know about… One of our goals throughout our approach to MV3 has been to gradually release new WebExtensions features that enable you to begin implementing APIs that are compatible with MV3.

Therefore, it’s an ideal time to consider migrating your Manifest V2 extensions. Early next year, Firefox will release Mozilla’s Manifest V3 (MV3).