In #7006 it looks like the changed tests taken together were too slow to finish running 10 times in the stability checker, and so all stability checker jobs failed.

The Firefox job ran for 49 minutes before:

The job exceeded the maximum time limit for jobs, and has been terminated.

The Chrome job ran for 19 minutes before:

No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

It would probably ultimately fail in the same way as Firefox, but could a periodic watchdog "echo still running" allow it for run for longer?

@bobholt