How to Develop a Profitable Browser Extension

The author initially built a web product to meet their own need of importing notes from WeChat Reading into a later-reading note-taking app for storage. After a while, they unexpectedly noticed someone promoting the product and saw its user base growing, so they started optimizing it and launched a paid one-time-purchase plugin plan. Early customers were acquired through one-on-one sales, and pricing was decided on a whim. Within three days of launch, the product generated over 1,000 yuan in revenue.

Original: https://lutaonan.com/blog/my-extension-sold-1k-yuan/