Only appears to affect Linux32 debug, for reasons I can't explain beyond general "slow as molasses" reasons. Probably not worth spending much time on beyond skipping the test, but worth filing in case someone else has any insights. https://treeherder.mozilla.org/logviewer.html#?job_id=122807510&repo=try TEST-UNEXPECTED-FAIL | browser/extensions/activity-stream/test/functional/mochitest/browser_getScreenshots.js | Test timed out

Was the original test disabled for various platforms/builds before? We might want to match some of that (except for the one caused by GCing the observer)

From what I remember, the original test (browser_PreviewProvider.js) was disabled on both linux and windows, both for frequent time outs (which I guess is the GCing the observer thing - bug 1343150)

Latest set of Try pushes suggests this is just a frequent intermittent on Linux builds in general.

Looks like this test got disabled across the board by bug 1389482. Not sure if we should bother leaving this open at this point.

k88hudson's turning off the test was somewhat accidental as part of how we were exporting beta changes to central for uplift. She also explicitly kept it disabled when exporting with bug 1391336. I pushed some dumping to try to see where it's timing out: https://treeherder.mozilla.org/#/jobs?repo=try&revision=79a3da54fdf104853dc15af6ab72c9b4856f466f Looking through bug 1343150 where this test came from, it looks like it was only intermittent on linux for a week per bug 1343150 comment 1 but then spiked from the GC weak reference change per bug 1343150 comment 3. We turned on the test after fixing the GC weak reference issue, so maybe it is indeed a linux specific slowness.

(In reply to Ed Lee :Mardak from comment #5) > https://treeherder.mozilla.org/#/jobs?repo=try&revision=79a3da54fdf104853dc15af6ab72c9b4856f466f Looks to be failing about 13% of the time on Linux32/64 debug or Stylo opt. But even on Linux32 debug, the test is normally finishing within 8 seconds max. Maybe we'll just skip the test on linux for now. I'll do a little bit more debugging as there might be an underlying failure to capture.. https://treeherder.mozilla.org/#/jobs?repo=try&revision=2c9a51970b59630da2fea9155097906c479eb2b2

ursula: Looks like it just needed to await the pref change: https://hg.mozilla.org/try/rev/69adbb8c4c76bf861edeef3a19589e545489ecc2#l3.41 https://treeherder.mozilla.org/#/jobs?repo=try&revision=69adbb8c4c76bf861edeef3a19589e545489ecc2

Fixed by https://github.com/mozilla/activity-stream/pull/3212 to be uplifted via bug 1392384.

I would prefer that we leave this open until the fix actually lands on mozilla-central.

Fixed with https://hg.mozilla.org/mozilla-central/rev/f0d5588153e4

Looks good AFAICT. I'll reopen if I see them again.