KeeFox can be installed and configured manually if preferred. Exact steps will depend on your operating system, Firefox version, etc. but the following information should help you see what the end result needs to be in order for KeeFox to function correctly.

Firstly, the KeeFox firefox add-on needs to be installed. This should be done in the same way as installing any other Firefox add-on.

You also need to install KeePass Password Safe 2. Again, follow standard installation procedures for an application and refer to http://keepass.info if you get stuck at this stage.

You need to then place the KeePassRPC.plgx file into a subfolder of the KeePass installation location called "plugins". This file can be found in the Firefox extension package in the deps folder. A firefox .xpi is just a zip folder so it might be easiest to just rename the file and browse the contents of the XPI to find the plgx file but you could alternatively choose to find the file in the extracted version of the extension in your firefox profile directory.

The final step is to make sure that KeeFox knows where to find KeePass. There are text boxes in the "advanced" tab of the KeeFox options dialog in Firefox where you can enter these details manually but if you have installed KeePass using the standard setup file you should find that KeeFox automatically detects the correct location when Firefox is restarted.