![]() ![]() Starting SW for a new event is essentially like opening a new tab. /onConnect for messages from content script in all tabs.chrome.webRequest if not scoped to a rare url or type,.chrome.webNavigation if not scoped to a rare url,.Problem 4: worse performance than MV2 in case the extension maintains a socket connection or the state (variables) takes a long time to rebuild or you observe frequent events like these: ![]() It means that your extension will be perceived as unreliable by the user. It means that when the event occurred in the last milliseconds of the 30-second inactivity timeout your code won't be able to run anything asynchronous reliably. Problem 3: Chrome 109 and older doesn't prolong SW lifetime for a new chrome API event in an already running background script. Problem 2: the worker randomly stops waking up for events. Problem 1: Chrome 106 and older doesn't wake up SW for webRequest events.Īlthough you can try to subscribe to an API like chrome.webNavigation as shown in the other answers, but it helps only with events that occur after the worker starts. Unfortunately, such an idyll is unsustainable in many cases. These extensions can be reworked to maintain the state, example. webRequest/webNavigation events with urls filter for a rarely visited site. The inactivity timer when no such requests or ports are open is even shorter: 30 seconds.Ĭhromium team currently considers this behavior intentional and good, however this only applies to extensions that observe infrequent events, so they'll run just a few times a day thus reducing browser memory footprint between the runs e.g. * is attached to the browser-action's `onClicked` event.Ĭ worker (SW) can't be persistent by definition and the browser must forcibly terminate all of SW connections such as network requests or runtime ports after a certain time, which in Chrome is 5 minutes. * For demonstration purposes, the notification creation In background.js: var pendingNotifications = We need this for the `Timeout` - see notes below Here is the sample code I used to achieve what is described above: Writing about it is simple, coding takes some more effort :)
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