My Gmail keyboard shortcuts stopped working
I've been an avid user of gmail's cool kid keyboard shortcuts.
A couple of days ago these mysteriously stopped working, knocking my reflexes off track.
I realized this morning that the culprit was the Vimium plugin for Chrome, which was stealing keypresses like 'J' and 'K'. Vimium's settings page allows you to turn off the plugin for specific pages based on a string match (in this case "http://mail.google.com/").
Back to normal now!