Rated 4 out of 5 stars

An essential add-on for efficient browsing that appears to be abandoned. Fix for "null" showing up when hovering over a link that doesn't have a title in newer versions of Firefox:

1. Right click on "+ Add to Firefox" and select "Save Link As..."

2. Save the .xpi file

3. Change the .xpi extension to .zip

4. Extract the zip

5. "url_tooltip-1.2.1-fx" -> "chrome" -> "url-tooltip" -> "content"

6. In "content," double-click "browser.xbl"

7. Click the radio button for "Select a program from a list of installed programs"

8. Click "OK"

9. Select Notepad

10. Click "OK"

11. "Ctrl f"

12. Find "null"

13. Replace all instances of "null" with quotes like this: ""

14. Save and close

15. Select all the folders in "url_tooltip-1.2.1-fx"

16. Right click on one of them

17. "Send to" -> "Compressed (zipped) folder"

18. Change ".zip" extension to ".xpi"

19. Drag new .xpi file onto your Firefox

20. Click "Install Now"

21. Restart Firefox

This review is for a previous version of the add-on (