Steps to reproduce:
- Go to test2.wikipedia.org in Firefox and reset your preferences.
- Open any page.
- See the "Start editing" splash screen. Click through it.
- Start editing.
- Wonder why I didn't see that big preferences dialog for the single edit tab.
Result: No prefs dialog for single edit tab.
Expectation: Seeing the prefs dialog for single edit tab.
Firefox only; always happens; repeatedly reproduced on two different Macs/two different accounts. This currently appears to be a Mac-only problem.