URL Suffix is a firefox extension that will allow you to easily add in the location bar URL prefixes and suffixes. You can change the prefixes and suffixes which are used to complete a URL on the location bar when using the Control+Enter, Shift+Enter or Alt+Enter key combination.

Usage:
1. Type a partial URL into the location bar, such as for example: "softsea".
2. Press the Control+Enter key combination.
3. Now the typed text is prefixed with "www." and suffixed with: ".com" for example.
4. The completed address is now opened.

The license of this software is Freeware, you can free download and free use this browser plug-ins software.