Roboform is compatible and can be used - but it is somewhat round the corner.
You have to use an adapted SeaMonkey Roboform Chrome extension plus the needed xpt and dll, start it via a K-Meleon Macro (kmm) and then start a new K-Meleon window.
I tested and used the package some while ago, IMHO it should still work. I can update and post test results on Monday (and the package if test is posivie
p. s. it is not us but the commercial provider Roboform that should help You