Courtesy of lifehacker comes this brilliant Firefox tip.

If you’ve ever tried copying and pasting a multi-line address into Google Maps just to realize that an input box will only take one line at a time—meaning that you have to copy and paste each line individually—there’s a simple Firefox tweak that will solve this problem:

Type “about:config” in the location bar. In the “Filter” field type “singleline.”
You can set the value to 2 for editor.singleLine.pasteNewlines, which will allow pasting of multiple lines to input boxes.