I’m handing over a single background.js file that drives a Chrome-style browser extension. After multiple quick fixes it’s cluttered and a little slow, so I need it professionally cleaned up without changing its visible behaviour. What I want you to do • Remove any dead or duplicate code blocks. • Optimise the remaining logic so the script loads and executes faster. • Refactor and re-organise functions for clarity, adding concise comments where context is needed. Deliverables 1. The revised background.js ready to drop back into the extension, fully lint-clean (ESLint/Prettier) and passing any existing build steps. 2. A short markdown changelog noting what was removed or refactored and why, so I can follow the decisions. Please keep all current extension APIs, message-passing and event listeners intact; nothing else in the extension should need to change. If you spot structural issues that require wider edits, flag them in the changelog instead of rewriting other files.