A developer shared on Indie Hackers that he sold his tab manager Chrome extension for $380k. Built it solo, grew to $8k MRR purely through SEO and Chrome Web Store rankings.

His approach: never spent a dollar on ads. Instead he wrote 40 blog posts targeting long-tail keywords like "how to organize browser tabs" and "best tab manager for research." Each post ranked within weeks because the competition was thin.

The buyer was a productivity tool company that wanted the user base. Deal closed in 11 days with an escrow service.