This has to be a problem caused by something that King did to Candy Crush. It crashed on two different computers running Windows 10, in different browsers, so I tried it on an older laptop running Windows 7, and it crashed there too, when trying to use a colour bomb. Thus, it's not the browser or the operating system, so…
This just started on Feb 1 after what looks like an update (the appearance of the game changed slightly when played on Facebook), I tried it in Chrome, Firefox and Edge, and the app crashed in all three, usually when doing a special swipe like colour bomb/wrap. I tried it in Chrome on a different computer and it crashed…