Thunderbird Fix It accepts two command line parameters:
/debuglevel=L, L in {0,1,2,3}
This command line parameter can be used to change the verbosity that Thunderbird Fix It uses to output debug information in its log to L.
Debug level 0 means that no messages will be printed to the log. Debug level 1 means that Thunderbird fix it will print only the most important messages. This is the default value. Debug levels 2 and 3 are very verbose and they are usefull only when you would like to submit a bug, as the amount of information will probably overflow the log bufferafter after a few commands.
/profile=profilename
Use this command line parameter to force Thunderbird Fix It use a specific Thunderbird profile (profilename) on startup. By default Thunderbird Fix It will startup with the last used profile. You can change the profile within Thunderbird Fix It (in the "File" menu).