Firefox options you want to look at...

[denny]

Edit -> Preferences -> Content -> 'Advanced' button to the right of Enable Javascript. Some very very useful ticky boxes. Enjoy.

(First two steps might be Tools -> Options in Windows?)

Comments

[sevenhelz.livejournal.com]

i unticked all of them... stupid javascript resizing things
thankee kindly sir
xx

[pooloftrees.livejournal.com]

I made use of this ages ago to only allow "move or resize window", but having thought about this, that is also annoying, so have just unticked that too.

Something else that is a very useful plugin for Firefox is NoScript (https://addons.mozilla.org/firefox/722/) which turns off Java and JavaScript (and optionally flash) on sites that you haven't set to allow scripting. It can cause one or two issues until you've enabled it for sites you really need it on like banking sites and most online shops, but it stops "interesting sites" from doing anything you don't want...