Strength:
• Open source. If you are not familiar with "open source", it means this add-on is more secure. Because its code is publicly available for review and contributions on GitHub at https://github.com/cloutierjo/titleUrl/
• Attractive GNU General Public License version 2. This means the software code of this add-on app is owned and supported by a friendly not-for-profit community. Instead of a for-profit corporation. And more secure because its full code is publicly available for review.
• Optionally customized the character(s) to separate page title and URL
• Optionally hide protocol from URL in title
• Works with KeePassX, KeePass

Challenge:
• Not yet able to add URL to HTTP Basic Auth pop up. Related ticket at https://github.com/cloutierjo/titleUrl/issues/1

Using
• Add-on version 1.03
• Firefox 52.8.0 (64-bit)
• Debian 8 Jessie 64-bit
• GNOME 3.14.1

An important add-on, however I give it 4 stars because of the forward slash at the end of the URL. Please remove the forward slash, its useless.