Developed and delivered the HackTheBox Theme Extension for the zed-industries/extensions repository, focusing on front end and theme development using TOML. This extension introduced two new dark themes, HackTheBox and HackTheBlue, to enhance user visual customization and support consistent branding across products. The solution was implemented as a lightweight, theme-only extension without a language server or bundled binaries, ensuring minimal maintenance and straightforward distribution. The initial 0.1.0 release included repository hygiene improvements such as sorted extension.toml and .gitmodules files, proper GPLv3 licensing, and compliance with extension naming standards, laying groundwork for future theme-related enhancements.