We are the premiere extension for watching YouTube videos together. Don't be fooled by others.Ĭreate your own Watch Parties and watch YouTube videos with friends. You can explore more about the tool on its official site or its GitHub page.Synchronize your YouTube video playback with friends! The #1 YouTube Watch Party. However, Mozilla gets access to the source code to review with every release, which makes it a recommended add-on to try. They clarified the reason as they do not want competitors to use the add-on and contribute nothing in return (more in their forum post). The server-side is open-source but unfortunately, the add-on is not open-source. Not just a privacy-focused, open-source alternative, it works super quickly without impacting your writing experience. As I write this, I have LanguageTool Firefox extension active. It should be good enough for basic spellcheck and common grammatical mistakes.

It is free to use, with an optional premium upgrade for advanced correction features. LanguageTool is an open-source grammar and spellchecker that respects your privacy, making it a decent alternative to the likes of Grammarly and others. But, this is an exception as a non-foss add-on, where the service is originally open-source, but the extension is not. Note: For this list, we try to recommend Firefox add-ons that are totally open-source.

Youtube downloader addon for firefox