freegpt

This extension injects into the translation page of ChatGPT, replacing it with a fully functional chat UI. You can choose the model, system prompt, and developer prompt in the settings.

Update 01.02.2025 - THEY FIXED IT!!

Check out the new tool I made - InjectGPT, works the same (also for non accounts user)

how it works

The extension intercepts all /conversation requests at the network level, replacing the model, system prompt, and developer prompt values with your current settings before they reach OpenAI's servers.

features

• model selection - switch between gpt-5-2, gpt-5-2-thinking, and other models
• custom system prompt - define how the AI behaves
• custom developer prompt - add additional instructions after user messages
• markdown rendering - code blocks, inline code, bold, and italic text render nicely
• settings persistence - your preferences are saved in localStorage

installation

1. clone or download this repo
2. go to chrome://extensions
3. enable "Developer mode"
4. click "Load unpacked"
5. select the extension folder

usage

1. go to https://chatgpt.com/en-EN/translate/ (or any translate page)
2. the custom UI will replace the translator interface
3. click the settings icon to change model and prompts
4. start chatting

files

• manifest.json - extension config
• content.js - UI injection and settings management
• injector.js - network-level request interception
• styles.css - dark theme styling

note

this is heavily vibecoded. im not a frontend dev.