Step 2: Under the Extensions tab given on the left side, you will see the list of all installed Add-ons. Step 1: If you want to uninstall some of the installed Add-ons on your FireFox, then open the browser and then use the keyboard shortcut- Ctlr+Alt+A to open the Add-on manager. After that, you will have successfully installed the add-on.

Step 6: Depending on the extension, you will then need to restart Firefox. When this process is complete, click Install/Add button in the pop-up that appears to complete the process. Step 5: The browser then downloads the plug-in. You can explore more about the tool on its official site or its GitHub page.Step 4: After that list of Add–ons will appears, select the one you want to install and then hit the “ Add to Firefox” button. 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.

Mozilla firefox add ons