SingleFile is a Firefox extension designed to save complete web pages as a single HTML file, preserving all elements such as CSS, images, and fonts. Users can easily initiate the saving process by clicking the SingleFile button once the page is fully loaded. The extension also provides a context menu for additional options, allowing users to save current tabs, selected content, or even multiple tabs simultaneously. The auto-save feature enhances usability by automatically saving pages after they load, ensuring that important content is never lost.

In addition to basic saving features, SingleFile offers advanced functionalities, including the ability to annotate saved pages with highlights and notes. Users can upload saved pages to cloud services like Google Drive or Dropbox, and the extension supports proof of existence by linking saved pages to the blockchain. With customizable shortcuts and a user-friendly options page, SingleFile is a comprehensive tool for anyone looking to manage web content effectively.