What is fehelper?

FeHelper is a browser extension for Chrome, Firefox, and Microsoft Edge that bundles a collection of utilities aimed at web developers. Instead of switching between separate online tools, you get everything in a single extension popup. The README is written in Chinese. The included tools cover a wide range of everyday developer tasks. For JSON data, there is a formatter that automatically detects and prettifies JSON on any page, plus a side-by-side comparison tool that highlights differences between two JSON blobs. For encoding and decoding, it handles Unicode, URL encoding, Base64, and MD5. It can generate and scan QR codes with custom colors. Code beautification and minification are supported for JavaScript, CSS, HTML, XML, and SQL. There is a lightweight API request tool similar to Postman that supports GET, POST, and HEAD requests, plus a WebSocket testing tool. Other tools include a timestamp converter, a random password generator, a simple note-taking app with folder organization, a Markdown editor with HTML-to-Markdown conversion, a full-page screenshot tool, and a color picker that lets you click any element on a webpage to get its color value. A recent update added an AI assistant for tasks like writing and reviewing code. The extension also lets you drag and reorder the tools in the popup to suit your own workflow, and the order is saved locally so it persists across browser restarts. Installation is available through the Chrome Web Store, Microsoft Edge Add-ons, and Firefox Add-ons. The README notes that accessing the Chrome Web Store may require a VPN in some regions. A direct download of the packaged extension file is also offered on the project website.