Quote:
Firefox does some funky stuff on startup. If you create a trigger using the "Window Created" event, add in the file path to the "Process Filename" match condition, use a 1000ms "Delay before checking match condition", you can then add the "Move window to selected monitor" action and it should work.
We have a guide on working with triggers here as well:
https://www.displayfusion.com/HelpGuide/Triggers/