UnderlineMe is a free in-browser notepad that lets you jot down notes in a privacy-friendly way. All notes will disappear once you're done with them. With a simple shortcut, you can open the notepad while browsing the web, and start typing away to create your next masterpiece.

If you're looking for a notepad that works on a desktop, you can use Notepad. You can take notes while browsing the various website without closing your tabs. This convenient browser extension can get your thoughts and ideas organized without hindering your work.