A small, focused workspace
Online CFG Editor brings text editing, inspection, comparison and Firefox AutoConfig helpers into one browser workspace. You can use the tools without an account. File processing runs on your device; the site has no file-upload endpoint.
What we check
The JSON validator uses the browser’s JSON parser. Other modes offer limited structural checks, not a complete language parser or a database of application settings. We show those limits alongside the results.
How the project is supported
The tools are free to use. A voluntary Buy Me a Coffee link appears after completed actions. Optional analytics are off unless configured by the operator and accepted by the visitor. Advertising is disabled in this release.
Independence
This project is independent and is not affiliated with Mozilla or the makers of applications that use CFG files. To report a reproducible issue, use the contact page and a small example with secrets removed.