BUG: JSON file appears when "back" button is pressed on issue page on browser

Bug

Curious thing.

When I navigate between 2 issues on my browser, pressing "back" button to jump from one to another, I see the metadata of the issues instead of their pages:

System info:

• Win 7
• Firefox Developers Ed

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Same thing on Chrome, only not "so beautiful" as in Firefox:

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cc/ @rspeicher @DouweM