RoboForm is one of those go-to programs that if it doesn't work in my browser, I don't use the browser. I became quite frustrated when RoboForm quit working in Chrome. I tried going into the Extensions manager to get any clues, and when I changed settings I got a pop up error message.
As it turned out, Chrome has a Windows 8 mode and a Desktop mode, and I was in Windows 8 mode. Apparently some Extensions in Chrome don't work in Windows 8 mode. I switched to Desktop mode, and magically RoboForm worked.