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If it's saved in Chrome you can do this: http://www.thewindowsclub.com/manage-view-saved-passwords-chrome

If you can't show the keys for active and owner it sounds like you're logged in with just a posting key though. Hopefully you can recover your original password if it was saved in Chrome but without at least the active key you won't be able to spend any reward.

You should still keep the password you wrote down safe. Someone may in the future come up with a brute forcing tool that can speed up the cracking by using the incorrect password as a hint. There is still a slight possibility that you can recover your funds in the future.