I get this if I work my machine too hard (or a website does same). Whether to let it go on or whether to kill and try again is simply a matter of experience. Sometimes it doesn't present the kill option until it's cleared and is ready to go on, but others need killing and re-engagement. Best to close all windows, stop all processes, stop all apps, clear history, cache, cookies, helps to speed up the machine. Do a restart of course. If all else fails kill the entire system and reinstall from factory supplied disc / do factory reset.
Reading the Daily fem is not an option. Try something else.......anything else!
PS google hates adblock - I suspect a connection