A free software that enables viewing of Firefox autocomplete data.

Firefox stores this data in an internal database file, but Firefox Autocomplete Spy can help you automatically find and view all of this Autocomplete history data from your Firefox profile location. For each entry, it displays the field name, value, total used count, first used date, and last used date.
Additionally, you can use Firefox Autocomplete Spy to view history files belonging to other users on the same or remote system. It also provides a simple one-click solution to delete all displayed Autocomplete data from the history file.
This software is straightforward to use for everyone, but it's particularly helpful for forensic investigators. Firefox Autocomplete Spy is fully portable and works on both 32-bit and 64-bit platforms, starting from Windows XP to Windows 10. If you're looking for a user-friendly and efficient tool to manage your Firefox browser's autocomplete data, give Firefox Autocomplete Spy a try.
Version 2.0: Mega edition with the support for Windows 10 version. Added more features like right click context menu & fixed the sizing problem with higher resolution computers.