I want to change language English into Dutch

No worries, this is easy to fix! Here's how to change Firefox language to Dutch:

Steps:

Open Firefox and click the three lines (☰) in the top right corner Go to Settings Scroll down to find "Language" section Click "Set Alternatives" button Click "Select a language to add" dropdown Search for "Dutch" and select it Click "Add" then move Dutch to the top of the list Click "Apply and Restart"

Firefox will restart and everything will be in Dutch! 🎉

If that doesn't work:

Go to Settings → General Look for "Firefox language" at the very top Change it directly to Nederlands (Dutch) from there

That should do it! Let me know if you need more help. 😊

Or for simplicity you can just get the Dutch installer from https://www.firefox.com/nl/download/ — and use that to update your existing instance to Dutch localization.