Stops pages from detecting when the user has switched tabs/windows.
Forked from Don't Make Me Watch (src) to add the blur event and make it work inside iframes.
Don't Make Me Watch, Page Visibility API Blocker
Stops pages from detecting when the user has switched tabs/windows.
Forked from Don't Make Me Watch (src) to add the blur event and make it work inside iframes.
Don't Make Me Watch, Page Visibility API Blocker