Browser Window Resizer
Firefox, Internet Explorer April 27th, 2007
Resize your browser to various standard resolution sizes.
The Browser Window Resizer is useful for testing different screen sizes. It accurately resizes your browser so you can test to see what a web page looks like in all of the standard resolution sizes.
Supports the 640×480, 800×600, 1024×768, 1280×1024, 1600×1200 resolutions.
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Resize the current page via the Context menu, Tool menu or Toolbar button.

Window Resizer for Internet Explorer resize the current page via the context menu (right-click) only.

The Firefox extension Resize the current page via the context menu, tool menu or toolbar button.