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Use JetStream Next for main branch (#300) #888

Job	Run time
Test Browser on macOS (safari, disabled)	1m 38s
Test Shell (jsc, disabled)	1m 35s
Test Browser on Linux (firefox, disabled)	1m 26s
Test Shell (jsc, default)	2m 36s
Test Browser on Linux (chrome, disabled)	1m 5s
Test Browser on macOS (safari, main)	1m 10s
Test Browser on Linux (chrome, default)	1m 7s
Test Build	36s
Test Browser on Linux (firefox, main)	49s
Test Shell (v8, main)	49s
Test Browser on macOS (safari, default)	1m 13s
Test Browser on Linux (chrome, main)	29s
Test Browser on Linux (firefox, default)	1m 30s
Test Shell (spidermonkey, main)	45s
Test Shell (v8, default)	2m 32s
Test Shell (jsc, main)	44s
Test Shell (spidermonkey, default)	4m 24s
Test Shell (spidermonkey, disabled)	1m 41s
Test Shell (v8, disabled)	1m 20s
	27m 29s