The Tool Buttons - Web browser
The WWW feature in MassAI is a small web browser, that serves two purposes:

Launching it from the TOOL BUTTON window, it navigates to the MassAI webpage, where you can check for updates and news.
B: By right clicking on a search result, you can choose to look-up the protein on the uniprot website.
The WWW feature then takes you directly to uniprot, where you can read details on the selected protein.