You might have come upon some popups that did not display all information because their dimension was to small to do so. Unfortunately though the developer has configured the popup this way that resizing is not working. This often happens when the developer created the popup for another browser, Internet Explorer for instance, and did not test it in Firefox or Opera.
There is however a way in Firefox to override the “cannot resize popup” setting which in turn makes it possible to resize any popup that you might come across. To do so you need to type about:config in the address bar of Firefox and filter for the term dom.disable_window_open_feature.resizable.
Set the value of this setting to true to be able to resize all windows in Firefox. The easiest way to do that is to simply double-click the entry. You can right-click the entry and select Toggle from the menu alternatively.
Related posts:
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- Increase Responsiveness of Firefox
- Resize The Firefox Window With Geometry
- Check if you Firefox speed tweaks are still active
- Firefox Search Tweaks
- 10 lesser known Firefox about:config parameters

Good tip! Thanks
Darn those popups! That’s a simple fix to a problem I’ve had in the past. Thanks for this cure.
Good tip. Thanks.
There is a firefox add-on which provides a GUI for this and related functions
http://urchin.earth.li/~tomford/firefox/index.html
Thank you so much for this. The help system for the BB software I’m using has popup windows like this, and it’s been driving me crazy! This is really a lifesaver for me – thanks again.
I am try to set a popup windows for live chat that doest not allow the user to resize the windows in firefor the code I have not works perfect for Internet Explorer but not for firefox