BTT menu "Disable for active app" shows wrong app

Describe the bug
I wanted to disable BTT for Microsoft OneNote so I clicked on the menu bar icon and selected "Disable BTT for ..." and found that the "active app" listed was always Firefox no matter what app was actually active.

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):
MacBook

Screenshots
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Device information:

  • Type of Mac: MacBook Pro Touchbar
  • macOS version: Mojave
  • BetterTouchTool version: 2.697

Additional information (e.g. StackTraces, related issues, screenshots, workarounds, etc.):

Note: Before bug reporting, please make sure you have the latest version of BetterTouchTool and that you have already tried to restart your system :-). If you encounter a crash, please attach a crash log from the macOS Console.app from the "User Diagnostic Reports" section.