Since the latest update v3.5.*, I'm unable to browse through different Vue apps on a page in Firefox. The app list does not show up anymore, and I can't access the apps dropdown in the Vue icon menu. This issue is not present in the Chrome version. I wonder if there's any chance this is a feature and not really a bug, but I couldn't find a setting to enable the list of Apps.

Here are a couple of screenshots for comparison:

Firefox

Chrome