Page Notes Lite by Matias Callum

Page Notes Lite lets you jot down short notes tied to the site you are currently visiting. The first screen shows the site origin so you instantly know where your note will be saved. Your notes are stored locally in your browser using WebExtension storage and never leave your device. You can add selected text from the page with a single click.
Open the popup, type your thoughts, and they will be available the next time you return to the same site. If you prefer, enable auto-save in the options so your notes are stored as you type. The extension injects a small content script only on demand when you press the Use selection button, avoiding any always-on page access. Everything is designed to be lightweight, private and distraction-free.