As a tip, they added a FocusWindow hotkey in version .33. If you give the montage (right click title -> config -> name) a title, you can then set focus before executing the webpage hotkey.
Example: Montage window title: MyMontageA
FocusWindow MyMontageA; https://finviz.com/quote.ashx?t=%SYMB%
Downside is that it'll always use that montage for the SYMB value.