Make sure you're in Chrome and have Scratchpad Command enabled.
Go to any website you desire.
Press command/control + J at the same time to bring up Scratchpad Command.
Search for the Lead/Contact/Account/Opportunity related to the note you wish you access and open it.
From the Scratchpad sidebar on the right, click on the square notes icon.
You can now select which note you would like to access.
From here, you can read and/or edit as needed.