Thread Navigating by Arrow keys

Use ← or → and Ctrl to navigate to previous, next, first or last page
Ekde 2015/05/13. Vidu La ĝisdata versio.
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// @name        Thread Navigating by Arrow keys
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// @description Use ← or → and Ctrl to navigate to previous, next, first or last page
// @author      theheroofvn
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