DeskCut is a cool firefox addon which lets you create a desktop shortcut to any webpage just with right context menu in firefox it does not, more over you can configure the location of the shortcuts created with this extension.
However the only minus point of this addon is that if you are version of firefox greater than 3.0.* you cannot install this addon or make it work in new versions of firefox after firefox 3.0
This extension basically adds desktop shortcut creation to the context-menu in firefox in simple words and save a lot of time in creating web shrtcuts to your favourite sites.
Note: Both Windows and Linux (KDE/GNOME) desktop shortcuts are supported.
Install DeskCut | Supported On Firefox: 1.0 – 3.0.*