Peek is a versatile browser extension for Firefox that enhances the way users interact with file links on web pages. By simply hovering over a link, users can view an interactive preview of various file types without needing to download them. This functionality extends to a wide array of formats, including PDFs, Microsoft Office documents, audio files, and video links from popular platforms like YouTube and Spotify. The extension leverages the browser's built-in rendering capabilities alongside third-party viewers to deliver seamless previews.

The range of supported file types includes documents such as Word, Excel, and PowerPoint, as well as multimedia formats like MP3, MP4, and images in various formats. Peek also accommodates links from Google Docs, social media platforms, and streaming services, making it a comprehensive tool for users who frequently engage with diverse content online. Furthermore, Peek prioritizes user privacy and security, with its open-source code available for scrutiny.