"A way you can resize the window "blind" is as follows: when the Firefox window is active, press Alt+Spacebar. This will drop down a little menu from the upper left corner of the window.
(1) Make sure it isn't maximized
Alt+Spacebar then press the R key once to restore to a resizable window
(2) To move the right side of the browser window to the left
Alt+Spacebar then press the S key once to start the move, then the right arrow once to select the right side, then the left arrow many times until you see the window border come to the part of the screen where you want it, then press Enter to finish."