I want to open a mixture of tabs and windows from a command line in a BAT or CMD file but the command-line parameters do not behave in a usable way. I want to have one window with 4 tabs, a second with 2 tabs and a further pair of single-tab windows. I have tried various combinations of command-line parameters such as -new-tab, -new-window and -url but the order in which the windows appear and what URLs appear in which tabs makes no sense. If I run a BAT that has a separate call to firefox.exe for each new window instance, the command will not process a line until the previous firefox process has been shut down. If I run a single call to firefox.exe with all of the desired URLs listed plus a mix of parameters, the process does not apply the parameters sequentially as entered, leaving me with duplicated tabs and windows which are not listed sequentially either. Am I doing something wrong or is there a design flaw? Thanks in advance to whoever tries to help.