It works with a local OpenAI API endpoint, topp!! Just, wish we could go back and forth.. but it will do it! ^^
Also, it's FOSS! Which is big thumbup from me!
Little guide if you are using Lemonade for kokoro, the end point is your "localhost:port/api/v1", API key must be "-", voice I like "af_heart", and model is "kokoro-v1".

Thanks BassGaming for making this extension!! ^^

cannot connect to TTS server, check API🤷🏻‍♂️👎🏻👊🏻

Simple! I planned on making something like this, and here I find a nice starting point! And since this add-on aint monitored for security yet I have drunkenly analyzed the code, but that didn't go to well, so I asked a handful of llms to do that for me. And I found out there are literally 30 malicious lines of code in here all tracing back to Russia! Nah but joke aside, thanks Mr. Bass. If I find something bad in the code sober I am going to be one happy to be unhappy, happily unhappy camper.

The Firefox extension and Kokoros work together like a charm, making my workflow seamless and boosting productivity. It's user-friendly, customizable, and performs flawlessly. The developers are attentive, regularly updating it for the best experience. Highly recommend it! Check it out on Github: Kokoros 🌟

It's worked, simple and straight!