Right click on the program, Icon on Desktop or in Quick Launch>
For a second IE Window>
This works for me.
Open Internet Explorer
Shift + click a link to force it to open in a separate window
Alt + Tab to return to the first window
Close it, leaving only the small window open
Drag the window edges/corners to adjust the size
Close the resized window
Open one IE browser window. Click on a link to open a second.
With the second, drag the corners to the edges of the screen.
Do 'Not' hit the maximize icon. Close the first window, then the second
(the order of closing is important).
Make sure you do File, Close; do 'Not use the X button!
Maximize Internet Explorer On Opening
Either way the next time you open a second browser window, IE saves the new default window size.
Firefox should be similar.
If none of those ways work, read the article in this link
IE New Window Maximizer
Is a program which will change the behaviour of IE and make new windows
AutoSizer - Resize Your Programs Automatically