I can’t tell you how much I hate when a web page resizes my entire Firefox window just because they decided to make a web document with a concrete size, normally smaller compared to my window size.
Luckily you can change a “hidden” option in Firefox to prevent that.
To change it, follow the following steps:
1 Open Firefox
2 Type “about:config” in the Location Bar and press Intro
3 Find “dom.disable_window_move_resize”
4 Double click on it so it changes from false to true
5 Close this Tab and you are done
That’s all, now you can keep surfing the net without this annoyance.