New Firefox windows opening on your second monitor? Second monitor off or in use for something else? I found a script and tweaked it slightly for my tastes to gather only firefox windows on the first display, and it woks beautifully. Original script posted and tweaked a few times
HERE.
My final version
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property processToInclude : {"Firefox"}
tell application "Finder"
set _b to bounds of window of desktop
set screen_width to 1680 - 1
set screen_height to 1050
end tell
tell application "System Events"
set allProcesses to application processes
set _results to ""
repeat with i from 1 to count allProcesses
set doIt to 1
repeat with z from 1 to count processToInclude
if process i is not equal to process (item z of processToInclude) then
set doIt to 0
end if
end repeat
if doIt = 1 then
tell process i
-- Let's make this guarantee that windows off to the right side are brought
-- entirely on-screen.
--
-- This solves an issue when switching from an internal main display
-- to an external one where windows are often at the farthest right
-- edge of the screen and you have to grab them near the close button
repeat with x from 1 to (count windows)
set winPos to position of window x
set _x to item 1 of winPos
set _y to item 2 of winPos
set winSize to size of window x
set _w to item 1 of winSize
if (_x < 0 or _y < 0) then
set position of window x to {0, 80}
else if ((_x + _w) > screen_width or _y > screen_height) then
set position of window x to {screen_width - _w, 80}
end if
end repeat
end tell
end if
end repeat
end tell