URL To Tab Title is a cool Firefox addon which lets you see the URL of the tab in the title of the tab in Firefox. This extension is supported from Firefox 3.0 – 3.7 pre alpha 1
Title in Tab
URL in Tab Title
By selecting "URL to tab title" from the tab context menu, you will swap title’s tab for tab URLs. This is useful when you work in a site that all the pages have the same titles!