explanation Rated 3 out of 5 stars

Clear explanation of what you will get and how to start it is missing.

Here are my tips
What it is: Midday Commander is a simple Norton Commmander-like fime manager application that opens in a new Firefox window. You will find buttons at the bottom of the window like "Edit [F4], Delete [F8]"

Under Preferences you can give one External Editor for text files, for instance
C:\WINDOWS\notepad.exe
and one External Viewer for picture files, for instance
C:\WINDOWS\system32\mspaint.exe

When you don't give an External Viewer, than
- if you double click on a picture file, it will be opened with your default picture viewer
- if you push "View [F3]" after selecting a picture file, it will be opened in a New Tab in your Firefox internet browser.
Note: Explorer.exe doesn't work as external viewer

How to start: After installing the add-in, look for Midday Command in the View menu.If you have no menu bar in Firefox, push [Alt] to make it appear.

Don't install it on FF15. Rated 3 out of 5 stars

It doesn't work on firefox 15. Im makes syntax error on browser.xul and main window does not open, i need to delete in manually from porfile.

This review is for a previous version of the add-on (1.5.4). 

You can install it on FF15

Well done — now it works on FF15beta too.