Note: you might also double hit the entry to do the same thing.
Once the about:config entry is displayed, right hit the entry and select Modify.
Enter the target path of your favorite code/text editor (without the quote marks).
For our example, we have chosen C:\Program Files\Editra\Editra.exe.
Click OK and cycle your online window to complete the changes.
That is all there is to it.
Have fun using your favorite code/text editor with Firefox!
