Related Clues:
- Browser extension, e.g
- Aftermarket purchase
- Extension; computer peripheral
- Supplemental item
- Software supplement
- Something more
- Second story, perhaps
- Unit of browser customization
- Bonus item
- Item that doesn't come standard
- Person assisting in a crime
- Handbag perhaps for accomplice?
- Tie clip or brooch, for example
- Something costing extra
- Build a third bedroom, say