I'm currently porting browser_urlbar_autoFill_backspaced.js (soon to be browser_autoFill_backspaced.js) to QuantumBar.

After porting the test, I'm seeing 6 failures of the form:

  FAIL autofilled value is as expected - "exam" == "example.com/" - JS frame :: chrome://mochitests/content/browser/browser/components/urlbar/tests/browser/browser_autoFill_backspaced.js :: test_autocomplete :: line 10
Stack trace:
chrome://mochitests/content/browser/browser/components/urlbar/tests/browser/browser_autoFill_backspaced.js:test_autocomplete:10
chrome://mochitests/content/browser/browser/components/urlbar/tests/browser/browser_autoFill_backspaced.js:null:61
chrome://mochikit/content/browser-test.js:Tester_execTest/<:1106
chrome://mochikit/content/browser-test.js:Tester_execTest:1134
chrome://mochikit/content/browser-test.js:nextTest/<:995
chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<:803

I think autofill is actually failing in these instances, though I haven't worked out manual steps to reproduce.

For now I'll disable the test for QuantumBar.

I've also had to disable browser_autoFill_preserveCase.js and browser_autoFill_canonize.js for similar reasons.

Drew, is there more to do here apart from the dependencies?

No, this is fixed.