Two popup window annoyances that come up are when you yourself can not resize a window because the designer has locked it down to that one shape and size and when a web site resizes your windows or moves them around without asking. We will start with that one first.
Stop Resizing and Moving My Firefox Browser
Turn Back on My Ability to Resize Any Popup Myself
Now the second situation you might find yourself in is when you want to resize the window but the designer locked it down so that you can’t. Thanks to gHacks.net though for finding this next tweak, you can override the “cannot resize popup” setting when you run into popups that can not be resized.
There is however a way in Firefox to override the “cannot resize popup” setting which in turn makes it possible to resize any popup that you might come across. To do so you need to type about:config in the address bar of Firefox and filter for the term dom.disable_window_open_feature.resizable. Set the value of this setting to true to be able to resize all windows in Firefox.
Restart Firefox and you should be able to resize those popup windows on any web site.