Screenshot2HTML is a powerful add-on for Firefox that enhances the browser's built-in screenshot capabilities. This subscription-based tool allows users to capture an unlimited area of web content, automatically splitting images when necessary. It supports saving images in both PNG and JPEG formats and can embed selectable text, making it somewhat similar to PDF functionality. The tool is compatible with older Firefox versions, starting from version 52, and does not require an internet connection, as it captures only static content without JavaScript or CSS stylesheets.

However, users should be aware of certain limitations, such as maximum dimensions for image files and potential glitches with animated or dynamically generated content. While it provides a convenient way to capture web pages, including support for right-to-left scrolling, it may not capture all scrollable content in sub-frames. For optimal results, users are advised to adjust settings in Firefox to enhance capturing capabilities and consider using an image viewer like Firefox for viewing HTML screenshots.