Enable Firefox as browser for e2e tests

[miyamotoh]

In order to support more hardware platforms (eg. IBM Power, Z), I'd like to propose running the e2e/integration tests with Firefox, instead of Chrome, as Chrome simply is not available on as many platforms as Firefox is.

However, I do realize switching browser would be risky to CI pipeline stability. So, as the first step, I'd like to propose some adjustments to existing test code/config to run in both browsers, for easy switching, while keeping Chrome as the default e2e browser, thus no immediate disruption. This would make testing with Firefox easier, thus lead to more stable and less risky switch, if/when we decide to do so.

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@openshift-bot: Closing this issue.

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