- Mozilla's ActorManagerParent was only being imported when devtools
were initialized (either by opening the Error Console or by connecting
via remote debugging). Import it in our ActorManager so Mozilla
actors, including AutoScroll, are always registered.
- This may have other effects! I'm assuming most of us test with
the error console visible, though, so we would've had Mozilla
actors, while users running without devtools wouldn't have. We
definitely want those actors. (Most of them, at least.)
- Don't override autoscroller styles with our panel customizations.
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