Leftside Back от Philipp König

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Due to security restrictions, the extension is not working on the Firefox Add-on website. So to test the extension simple navigate to another website, where everything should work fine :)
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This extension turns your left side of your browser window into a large back button. It allows you to navigate back by just clicking your mouse button on the left side of your screen. You can configure whether to display an indicator bar, increasing the width of the tolerance area or enabling to also navigate forward by right clicking the edge of the browser window.