How to get your initial first users? who'll be willing to give you feedback on your product?

I recently launched my chrome extension, Chroma Palette 🎨 it's a simple yet useful Chrome extension that instantly extracts the dominant color palette from the visible area of any webpage, it's a color picker for the most dominant colors on the page. But, I don't know, how to get the initial first users, is it as simple as talking about your products on platforms like reddit, twitter etc. ?