Firefox: Prevent Sites From Disabling Window Resize
Posted on Jan 21, 2008 under Firefox Tips |You know how some web sites open up windows and make it where you can’t resize them? It’s annoying. Here’s how to prevent this.
1. In Firefox type about:config in the address bar and press ENTER.
2. Locate and double-click the entry for layout.frames.force_resizability to set the value to true.

by Ian, on February 23 2008 @ 2:21 pm
Another way is to do the following:
Open the browser and click on Tools, Options, Content.
Then click on the “Advanced” tab next to Javascript and in that menu, un check the “Move or resize existing windows” and click ok