Web companies and services sometimes limit popups on their sites artificially which means that the user has no option to resize them in a web browser. We have already mentioned a configuration setting in Firefox to resize popups. In short: Users need to set the parameter dom.disable_window_open_feature.resizable to true for this.
But fiddling around in the Firefox configuration is not to everyone’s liking. The Firefox add-on Popup Resize brings the feature in form of an extension which works right out of the box and comes with a few extra settings to configure the behavior individually.

By default, the majority of unresizable popups should now be resizable just like standard windows in the web browser. Another popup annoyance is the limited interface they are shown in, usually without menubar, locationbar or statusbar.
The add-on takes care of that as well and adds the locationbar and statusbar to popup windows automatically. Users can furthermore add the menubar, toolbars and scrollbars (if required) to all popup windows.
It is on the other hand possible to remove all the bars from popup windows in the add-on options.
Popup Resize is a handy add-on for Firefox, especially for users who have to work on sites regularly that make use of unresizable popup windows.
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JavaScript Popup Blocker for Google Chrome
Google Chrome Popup Blocker
Opera Popup Statusbar Extension
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Cheers Martin will come in handy for games etc