In mid-June, the Fiddler for Linux Alpha (running atop the Mono framework) was updated.
The new build supports a C#-based scripting engine (bringing the power of FiddlerScript to Linux for the first time), and includes the new PCAP/PCAPNG importer code that allows you to open these low-level network captures directly within Fiddler. This new build also includes a variety of UI enhancements for Windows-parity, including customizable columns, column search, and more.
If you’re on Linux, please give it a shot. If you find any problems, please let us know using the Help > Send Feedback option.