Tools >> Options >> Content >> Enable Javascript >> Advanced…

Make sure that you allow scripts to ‘Move or resize existing windows’

Also – for anyone having problems with the positioning, check the bookmarklet. Some are using AvailWidth twice. The AvailHeight should be used for the last parameter.

For example, 1024×768 C should be:
javascript:self.resizeTo(1024,768);self.moveTo((screen.availWidth-1024)/2,(screen.availHeight-768)/2);

Read more: http://www.hongkiat.com/blog/firefox-resize-bookmarklet-now-with-re-positioning/#ixzz0dECmHQcL

Recently a pop-up changed my default window size to approximately 1″ x 1″. Tried manually resizing them all.

That fix seemed sufficient (visually), but caused problems: for example, after doing this, my XP toolbar refuses to auto-hide until I’ve Alt-Tabbed through nearly all windows. (For cxample if I have 10 windows stacked on the toolbar, auto-hide won’t come back until I’ve manually gone through and made 9 of those windows the current one, even if only for a moment on each.)

In hopes of prevent future mass auto-resizing without my consent, I’ve gone into “about:config” and changed this setting to have a value of “false”:

dom.disable_window_open_feature.resizable

Don’t know whether that’ll work, but figured it was worth a try.

Any chance of fixing? Thanks!

Shaun_R