Do you know about window.setImmediate or window.clearImmediate ?

Did you know that you can use these now with the Add-on SDK ?

We’ve managed to keep them a little secret, but they are awesome because setImmediate is much quicker than setTimeout(fn, 0) especially if it is used a lot as it would be if it were in a loop or if it were used recursively. This is well described in the notes in MDN on window.setImmediate.

To use these function with the Add-on SDK, do the following:

const { setImmediate, clearImmediate } = require("sdk/timers");

function doStuff() {}
let timerID = setImmediate(doStuff);  // to run `doStuff` in the next tick
clearImmediate(timerID)               // to cancel `doStuff`

http://work.erikvold.com/jetpack-pro-tip/2014/09/25/setImmediate.html