How do I delete autofill data in Mozilla Firefox?

To delete autofill data (Form & Search History) in Mozilla Firefox, follow these steps:

1. Click on the Firefox menu icon (usually three horizontal lines) located in the top right corner of the browser.
2. Click on History in the menu that appears.
3. Click on 'Clear Recent History...'. This will open a dialog box.
4. In the "Time Range to Clear" dropdown menu, choose 'Everything'. This ensures all autofill data is removed, regardless of when it was saved.
5. Click on the arrow next to Details to display a list of items that can be cleared.
6. Make sure the box next to 'Form & Search History' is checked. This specifies that you want to delete the autofill information.
7. Click Clear Now. Firefox will then delete the selected history items, including your autofill data.

Essentially, you're clearing your browsing history with a specific focus on removing saved form and search data. This action helps to protect your privacy and remove potentially outdated or unwanted autofill suggestions.