e2e: use firefox as headless browser #4680

Job	Run time
Set application version and env profile	4s
Build and package	5m 4s
Run backend unit tests	2m 47s
Run frontend unit tests	1m 52s
Run E2E multi windows tests	0s
Run E2E tests (1)	3m 32s
Run E2E tests (2)	3m 32s
Run E2E tests (3)	3m 34s
Run E2E tests (4)	3m 35s
Run E2E tests (5)	3m 37s
Run E2E tests (6)	3m 31s
Run E2E tests (7)	3m 35s
Run E2E tests (8)	3m 32s
Run E2E tests (9)	3m 37s
Run E2E tests (10)	3m 37s
Run E2E tests (11)	3m 37s
Run E2E tests (12)	4m 29s
Push to registry	25s
Generate and upload source maps to Sentry	0s
	54m 0s

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