YT Transcript & Summary

A Firefox extension that adds a Copy Transcript button and an AI Summarize button to YouTube video pages. Supports light and dark mode, plain text, and Markdown output.

Built on top of YouTube Transcript Copier by dislikelever, released under the MIT License.

Features

• One-click transcript copy to clipboard
• AI-powered video summarization with configurable providers (OpenAI, Anthropic, Google Gemini, Groq, OpenRouter)
• Light & dark mode – adapts to your YouTube theme automatically
• Copy as Markdown – headings, links, and timestamp tables
• Plain text with or without timestamps
• Paragraph mode for continuous reading
• Optional video title and URL in output
• Summary displayed inline on YouTube or copied to clipboard
• Configurable system prompt and model selection
• Settings persist via chrome.storage.sync (falls back to localStorage)
• Resilient to YouTube's SPA navigation

Installation (development)

1. Open about:debugging#/runtime/this-firefox in Firefox
2. Click Load Temporary Add-on…
3. Select manifest.json from this folder

Build & Publish

See the Firefox Extension Workshop for full instructions on publishing to AMO.

Credits

• Original extension: YouTube Transcript Copier by dislikelever
• This derivative: YT Transcript & Summary by felixleopold

License

MIT