fish_config starts the web-based configuration interface.
The web interface allows you to view your functions, variables and history, and to make changes to your prompt and color configuration.
fish_config starts a local web server and then opens a web browser window; when you have finished, close the browser window and then press the Enter key to terminate the configuration session.
fish_config optionally accepts name of the initial configuration tab. For e.g. fish_config history will start configuration interface with history tab.
If the BROWSER environment variable is set, it will be used as the name of the web browser to open instead of the system default.