I assume a lot of processing is happening in a per tab context, I wonder how easy a queue would work in the browser? An optional local self-hosted server script might help.
Actually, a tab only sends its content to a unique offscreen document[0], and because of the single-threaded nature of JS, it works as a queue. So, you are right, throttling might be feasible without too much hurdle.
[0] https://developer.chrome.com/docs/extensions/reference/offsc...