Removing entered data

[for Firefox users]
Here’s another frequently asked question about Firefox:
When I start entering text in to a search field (or any other text field, like name, address, etc.), I get a drop-down list of items I previously entered in the same field. How do I remove one of those entries?

Answer:
Use the arrow keys (one your keyboard) to highlight the item in the list, you want to remove. Hold down the Shift button, and press Delete.