When firefox is automated + interacted with manually, input composition
might get stolen from Text Input Processor.
Re-requiring TIP every time seems to fix this.
References #5460
Notable changes:
- javaScriptEnabled moved to the browser side.
- enabling new UI since it no longer helps to fix screencast
Review branch: https://github.com/aslushnikov/juggler/tree/roll-to-91-0-b10
Note: this will have 2 screencast tests failing. Investigation is in a follow-up.
