A lot of the intermittent failures ("oranges") that are happening on the test machines, are race conditions, like low memory conditions/high disk usage/slow web server/etc.
When trying to fix one of those intermittent failures, I noticed how that test is able to fail: it is relying on bfcache to work.
Especially on mobile, that is a bad assumption.
One thing that could be improved is to clear the cache after each mochitest. But I also think the tests themselves shouldn't rely on bfache to work (unless of course, they are testing bfcache). So I filed bug 1057499 and pushed a tryserver run there to see how things go with bfcache turned off. Could be interesting.
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