Anti-Blur
What it does#
Stops a site from knowing you looked away.
Switch tabs, click into another app, or move the mouse off the page, and most sites can tell. They use it to pause the video, stop the timer, dim the page, throw up an "are you still watching?", or simply record how long your attention was elsewhere. Anti-Blur makes the page believe it is focused and visible the whole time.
"Blur" is the browser's word, not the camera's. A blur event is what a page receives when it loses focus. Nothing here sharpens an image.
What that looks like in practice#
- Videos keep playing when you switch tabs.
- Timers, animations and countdowns keep running.
- Attention analytics get a flat line.
What it is not for
This page used to list "exam and training pages stop logging that you left" as a feature, which is a use the Terms prohibit — defeating proctoring, or a training record someone relies on, is the one thing Anti-Blur is not sold for. Advertising it and forbidding it at the same time is not a position, so the line is gone.
What it cannot do#
- It cannot stop a site that measures something else — a page that watches request timing or frame rate can still infer a great deal.
- It does not block ads or trackers. That is Sodium.
- It does not stop a site recording your screen. That is Perch.
Turning it off for one site#
There is no per-site switch. The extension is on for every page or off entirely — use Chrome's own extension menu to disable it while you need a page to behave normally.
Its own terms and privacy policy#
Anti-Blur carries its own two documents rather than sitting under the subscription's: Terms of Use and Privacy Policy. Everything else on this site is governed by the Terms and Privacy linked at the bottom of every page.
What it can see#
Nothing. Anti-Blur asks for no permissions at all: no storage, no network access, no service worker, no third-party code. It is a single script that runs before the page's own scripts and changes what four browser properties report.