Newsletter Subscriber Finder
Find emails of newsletter subscribers via Substack.
creator
PlugThis prompt
Build a Chrome extension called "Newsletter Subscriber Finder" that, on a Substack publication's public "Notes" or "Comments" pages, extracts the visible commenter handles, dedupes them across pages, and resolves Substack profile → display name + linked socials (X, LinkedIn). Output a CSV with handle, display name, profile URL, and any linked socials. Respect rate limits with a service-worker queue. Permissions: storage, activeTab, downloads. Host permissions: https://*.substack.com/*. Manifest V3 with content script.
How to build it in 3 minutes
- Sign in to PlugThis and open the chat input.
- Copy the prompt above and paste it into the chat.
- PlugThis generates the full Manifest V3 extension in 60-90 seconds.
- Download the zip, extract it, and load it via
chrome://extensionsdeveloper mode.