mozilla/activity-stream

Perma-fail: debug browser_highlights_section.js | there should be 1 of [data-mochitest='highlights-card-placeholder'] found 3

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@piatra this seems to be failing on linux and windows:

FAIL | browser/extensions/activity-stream/test/functional/mochitest/browser_highlights_section.js | there should be 1 of [data-mochitest='highlights-card-placeholder'] found 3
Stack trace: chrome://mochitests/content/browser/browser/extensions/activity-stream/test/functional/mochitest/head.js:check_highlights_elements:125
https://treeherder.mozilla.org/logviewer.html#?job_id=143511024&repo=pine&lineNumber=14901

As well as a bunch of
FAIL | browser/extensions/activity-stream/test/functional/mochitest/browser_topsites_section.js | A promise chain failed to handle a rejection: cache is undefined - stack: null Rejection date: Fri Nov 10 2017 01:04:34 GMT+0000 (UTC) - false == true
JS frame :: resource://testing-common/PromiseTestUtils.jsm :: assertNoUncaughtRejections :: line 253
https://treeherder.mozilla.org/logviewer.html#?job_id=143511024&repo=pine&lineNumber=15536

That latter one is failing on all platforms:
mac: https://treeherder.mozilla.org/logviewer.html#?job_id=143510757&repo=pine&lineNumber=27770
win32-noe10s: https://treeherder.mozilla.org/logviewer.html#?job_id=143516756&repo=pine&lineNumber=28571
win32-e10s: https://treeherder.mozilla.org/logviewer.html#?job_id=143516761&repo=pine&lineNumber=40261
win64: https://treeherder.mozilla.org/logviewer.html#?job_id=143518254&repo=pine&lineNumber=38405

I'm not seeing this locally (osx & linux).

JavaScript Error: "TypeError: cache is undefined" {file: "resource://activity-stream/lib/Screenshots.jsm" line: 79}

@Mardak any idea how it could be calling into Screenshots without having a cache?

And failure screenshot.
image