IG Identity Resolver 作者： Andrew

IG Identity Resolver is a lightweight Firefox extension for anyone who works with Instagram accounts — developers, OSINT researchers, social media managers, or curious users.

What it solves
Instagram users frequently change their usernames. When that happens, friends and followers lose track of each other with no native way to search by the original account. Numeric IDs never change — so resolving a username to its permanent ID (or back) gives you a reliable reference to any account regardless of what they rename themselves to.

Features
- Username → Numeric ID lookup
- Numeric ID → Current Username lookup
- Profile card with picture, username, ID, post count, followers, and following
- One-click copy for username and ID
- Random math CAPTCHA on every query to block automated abuse
- No data stored, no external servers — all queries go directly to Instagram's own API

How to use
1. Log into instagram.com in Firefox first
2. Click the extension icon
3. Pick a mode: Username → ID or ID → Username
4. Enter the value and solve the quick math problem
5. Hit Resolve — the profile card appears instantly