In February 2026, Kugland developed a declarative Firefox handlers configuration for the nix-community/home-manager repository, enabling users to specify MIME type and URL scheme handlers directly through Nix modules. By introducing programs.firefox.profiles.<profile>.handlers, Kugland allowed per-profile customization of actions such as PDF viewing and mailto handling, aligning with the project’s declarative configuration philosophy. The implementation included comprehensive tests to ensure robust and reliable behavior across different environments. Kugland’s work leveraged expertise in Nix, configuration management, and Firefox integration, delivering a feature that enhances automation, consistency, and user control for managing Firefox’s handlers.json in a reproducible manner.