Custom Slack Shortcuts With Karabiner

Slack has a couple of useful keyboard shortcuts for navigating between unread channels. Unfortunately they use awkward combinations of keys involving multiple modifiers and an arrow key (⌥⇧↓ and ⌥⇧↑). If these shortcuts were exposed in the menu bar they could be modified using the built-in support for custom shortcuts in Mac OS X. As an alternative the following Karabiner config can be used to change the next unread shortcut to something more sane. I chose ⌘J:

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