Filmweb notes is a Chrome extension developed by santiagocarcassone. This free tool allows users to add notes to each film on filmweb.pl. The notes are stored persistently in Chrome sync storage, ensuring data security.

An experimental feature of this extension is the ability to save the runtime of each movie in sync storage. This information is then displayed on the "want to see" page, enabling users to sort movies by runtime. To save the runtime, users need to visit each movie's page. Another experimental feature allows users to load notes into the extension by submitting them in JSON format through the extension's popup menu.