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. You can explore more about it in its GitHub page or get the add-on to try it out. It is an open-source project that respects users’ privacy. In either case, you can create a list of sites to whitelist/blacklist. You can also choose to enable it on specific websites and have it disabled for the rest. However, if you think that a dark mode is unreadable (or doesn’t look good), you can customize the color, contrast, brightness, and grayscale as well. The extension simply changes the background and text color to blend in as a dark mode theme.īy default, it works well with almost every website. Dark Readerĭark Reader is a popular browser extension that lets you turn on the dark mode for websites. It is important to note that just because it’s Firefox, not every add-on is open-source.įurthermore, there are several open-source projects with a Firefox add-on, but with a different license. But, what about its add-ons (or extensions)?Ĭonsidering that you prefer open-source solutions, are you using add-ons for open-source services? What are some of the best open-source Mozilla Firefox add-ons that you can install? Open-Source Mozilla Firefox Extensions You Should Try

In fact, it is one of the best web browsers available for Linux. Mozilla Firefox is easily one of the most popular open-source web browsers among Linux users.

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