How to delay running the script until the opened tab was focused on?

[enchained]

I have a script with default @run-at (document-idle), that sends about 1-3 requests to an external API per page. API has a strict call limit, so I'm looking for a way to space out the requests. Usually there is a lot of pages opened one by one in background, and no need to pre-load data from requests in the background.

I was wondering, is there a proper way to inject or run the script only when page tab becomes active, only once per page? Should I just wrap my script into something like document.addEventListener("visibilitychange") and check if it's already been run before, or is there some native way to do that?