allow configuring a firefox profile for remote selenium setups
allow configuring a firefox profile for remote selenium setups

Change-Id: Iea872120dc6d328940158b21206be3e5ae5bb2b7
Reviewed-on: https://gerrit.instructure.com/4659
Reviewed-by: Zach Wily <9de8c4480303b5335cd2a33eefe814615ba3612a@instructure.com>
Tested-by: Zach Wily <9de8c4480303b5335cd2a33eefe814615ba3612a@instructure.com>

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