Tools > Options > Content - Enable Javascript
Then hit the Advanced... button. Did you de-select the pref for "Move or resize existing windows"?

hi there

no, the check box is checked

Do you have that problem when running in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode
Don't select anything right now, just use "Continue in SafeMode."

If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...

it does it in safe mode too and I have disabled all themes, addons and plugins

Maybe the Javascript coding for those popups just doesn't work in Firefox?
Purely a guess though, without having some examples to see.

Maybe our resident Javascript guru will have some ideas for you in a little while, he usually logs on here about this time each day.

No I dont think its related to script as it used to work a few days ago then stopped, nothing changed, no new addons nothing to make it weird and not just 1 website's javascript popups, the entire internets javascript popups dont resize

Do those pop-ups open in a new window or in a tab in the current window?

Do you have the current Firefox window maximized?

You can also check:

• http://kb.mozillazine.org/Corrupt_localstore.rdf
• http://kb.mozillazine.org/Preferences_not_saved

they open in a new window

I have followed everything suggested in those articles and its still happening