Risk: Moderate

Building browser plugins as a side hustle can be risky for beginners starting from scratch, especially if they can't afford to lose money. Beginners could potentially lose money invested in development tools, marketing efforts, and other resources. There have been cases where beginners spent money on development costs without generating any revenue in return. Startup costs for building browser plugins can range from $100 to $500 or more, and there is no guarantee of immediate or significant returns. Online discussions often mention the challenges of failing to attract users or monetize the plugins, leading to financial losses and wasted time. I'd rate the risk a 2 out of 5 because beginners may face significant financial risks and uncertainties in this venture.