This is a great product idea. Arc from The Browser Company has a highly visual, design-forward identity. A "Theme Download" feature would let users customize Arc's sidebar, gradients, and folders.

Below is a for an "Arc Theme Download" feature, written as if for an internal product doc or a feature announcement. Feature Name: Arc Theme Download 1. The Problem Currently, Arc allows basic color changes (solid or gradient) for the sidebar. Users want to express personality, support creators, or match their OS aesthetic. Manually recreating complex themes (e.g., "Synthwave," "Midnight Forest," "Gruvbox") is tedious. 2. The Solution A curated, downloadable theme store integrated directly into Arc's "Appearance" settings. Users can browse, preview, install, and share themes with one click. 3. Key Components A. Theme Format ( .arctheme ) A lightweight JSON file containing:

Introducing Arc Themes — download, create, and share custom looks for your sidebar. From 'Coffee at Midnight' to 'Tokyo Rain,' make Arc yours in one click.

Browse 100+ community themes today. More coming every week."