Confluence Mobile view navigation menu items do nothing under iOS9

Steps to reproduce

1. Log into a Confluence 5.9.1-OD-2015-39 instance on an iPhone running iOS9.
2. Tap the navigation icon at the very top left (the hamburger menu).
3. Tap any of the items ("Dashboard", "Recently Viewed", etc.).

Expected results

Whichever menu item you selected loads.

Actual results

Absolutely nothing happens when any of the links in the menu are selected.