2 possible things you could do:
append this in /home/<yourname>/.bash_profile to the export PATH=/.....
now MozillaFirebird is in your PATH and you can just type "MozillaFirebird" to start it.
Or you can add a menu entry in the KDE menu,
right click on the K symbol on the taskbar and choose "Menu editor"
Then just make a new item where you want it.