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?

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.