- Replaced automatic content script injection with manual toggle via extension icon
- Implemented background service worker to inject or remove overlay on click
- Ensures overlay iframe and control panel are fully removed when toggled off
- Prevents duplicate overlays by checking for existing elements
- Added icon support for active/inactive state in the toolbar
- Now supports per-tab activation with isolated overlay control
- Removed automatic content script injection from manifest
- Added background script with click handler for toggling overlay
- Overlay is now injected only when extension icon is clicked
- Overlay can be removed by clicking the icon again
- Prevents unintended injection across multiple tabs of same domain
- Per-tab state tracking for clean UX
