DeepSeek Harness Plugin: Browse Web Pages Directly in the Sidebar

The DeepSeek Harness plugin deep-browser embeds HTTP(S) web pages in the right sidebar of the conversation for seamless context continuity. Core features include creating new tabs, address-bar navigation, and layout control (Fit/390/768). Installation requires using the official command, while local development requires building the plugin first. It relies on the Web Profile and does not support advanced features such as cookies, caching, and highlight annotations, aiming to provide a lightweight sidebar browsing experience for developers who need to quickly cross-reference web pages with conversation content.