I strongly recommend you use a password manager. My favorite is LastPass. It works across all the browsers I use and all major operating systems. It's inexpensive and easy to use.
LastPass keeps your passwords, secure notes, and using the matching browser extension or app on your mobile device, it can autofill passwords when you need them.
Lastpass goes one step further and lets you share a username and password with someone else without actually revealing your password. This is particularly useful when you need a staff member, or a consultant to log into one of your accounts but you don't want to actually share the password.
They're currently running a special for Earth day, offering a 25% discount. I would definitely recommend you take a look if you don't already use it. Here's the link to check it out.