are there any plans to make it work on youtube?

Works perfectly. I don't get why someone would complain about the need for a ChatGPT API key. The developer of this add-on let's you use his work for free. You should not expect that he pays the API calls for you too.

A really nice add-on / extension to summarize longer articles, blog posts, etc. I would love to see this extension modified so that it can access the text in Firefox F9 "reader mode". It would also be nice to be able to access/read text from OCR / text enabled PDFs opened in the browser.

Requires paid GPT API key.

Yesterday it worked fine. Today I retry and it fails with
"TypeError: NetworkError when attempting to fetch resource".
The DevTools reports:
"Content Security Policy: The page’s settings blocked the loading of a resource at https://api.openai.com/v1/chat/completions".

Good job, very helpful.