Quote URL Text
Quote URL Text is a Firefox Extension.
You can download it from the Firefox Add-Ons site.
Quote URL Text copies selected text to your clipboard, along with other data that you can specify.
For example, let’s say I’ve selected (i.e., highlighted) the following text from cybernetnews.com:

I then right-click on the the text, and instead of choosing “Copy,” I choose “Quote Text”:

When I go to paste this text somewhere, like a word processor, here is what I will see:

Notice the Address of the page appears after the selected text.
You can add other data in the extension’s Options Window:

When everything is selected in the Options Window, here is the result from the above highlighted text:
















