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Extensions 
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Download Window Resizer chrome extension. Resize browser windows to test layouts on different resolutions with multi-window support. and install in your Google chrome browser. This is Direct Window Resizer Crx download for Chrome it is also called Window Resizer offline CRX for chrome Download. This Window Resizer is used to Resize browser windows to test layouts on different resolutions with multi-window support.
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Test responsive web designs or mobile pages and see if it is mobile friendly
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Resize Google Chrome windows.
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Resize browser's window to mobile, desktion or custom sizes
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Resize the current window into different customizable layouts (Multiple monitors are supported).
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Show multiple screens once, Responsive design tester
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Responsive design testing tool to test any website’s responsiveness – it only takes 2 seconds! Emulate various screen resolutions.
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Resize the browser window to emulate various screen resolutions.
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Quickly moves your Firefox window to a pre-defined position on your screen.
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Resize window with a 'key'stroke.
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Easily set the layout (size & position) of your browser window
