How to keep script running when extension popup is closed

Question

How can I keep the script in the extension running?

I've got a popup.html and my script needs to run on this popup.html. I set the timer, I'm starting it and it starts to count down, once I close the popup, the timer stops. Apparently, the whole popup.html is unloaded once I click away.

Answer 1

Have a look at Web Workers: https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers

These run in the background indepently from your window context.

Edit: I just checked this again and as @wOxxOm correctly states in his comment you should use Background Pages in chrome extensions. The link provides an example: https://developer.chrome.com/extensions/background_pages