[Feature request] Add a shortcut about back button.

I hope add a mouse shortcut about back button, in other words, can act as other pdf reader like sumatra that can back to the previous page after pressing a citation or bookmark. When you are reading a paper and meet a citation or formula you intersting in, you click the citaion and download it. Then, you need move your mouse to "back button" and click it, or put your hand on keyboard in order to input "alt + left". It could be more simple just clicking you mouse4/5 rather than doing serval actions. Many thanks.
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