Idle time detection seems to be triggering too quickly

I have idle time detection turned on, with “Notify when idle for more than” set to 15 seconds. But I frequently seeing idle-time popups with smaller times than that, like 5 seconds.

I do have the extension running in two browsers (Chrome and Firefox). I understand this might cause some excessive popups. But the threshold is set to 15 seconds in both browsers, so surely the pop-up should always wait at least that long?

I have checked Idle time settings issues, but unlike that poster I’m not using the desktop app, only the browser plugins.

Hi! Could you confirm the extension version on both browsers please and share the idle settings here for both as well?