[test/fix] prevent FirefoxHelper from silently failing to start This was breaking some tests without any obvious error message and you should fail as early as possible to make debugging easier. Closes #17260390

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etc/init.d

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etc/cubicweb.d

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usr/bin

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var/log/cubicweb

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var/lib/cubicweb/backup

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var/lib/cubicweb/instances