I wish I’d known this years ago…
- Point your brower to about:config.
- Where it says “Filter” at the top, type in “resize”. Or just scroll down to “dom.disable_window_move_resize”.
- It probably says “false”. Right-click on it, and select “toggle”. Now it says “true”.
- You’re done!
This is for OS X, but I’m pretty sure it’s almost identical in Windows and Linux. No more seeing your carefully-constructed desktop hijacked by evil websites insisting that you view their content in a full screen! Yay!