Reproducible: 1/2

Steps to reproduce:

1. Open newtab and load wikipedia
2. Mouse hover over icon in addressbar
3. Switch tab back
4. Load https://helpx.adobe.com/flash-player.html and wait for loading
5. Mouse hover over icon in addressbar

Actual results:
tooltips are blank. After I tried 2-3 times, the tooltip display properly
See attached screencast

Expected Results:
tooltip should display properly

this seems to be regressed by Bug 1596990

:alice0775, if you think that's a regression, then could you try to find a regression range in using for example mozregression?

(In reply to Release mgmt bot [:sylvestre / :calixte / :marco for bugbug] from comment #2)

:alice0775, if you think that's a regression, then could you try to find a regression range in using for example mozregression?
(In reply to Release mgmt bot [:sylvestre / :calixte / :marco for bugbug] from comment #2)
:alice0775, if you think that's a regression, then could you try to find a regression range in using for example mozregression?

Steps to reproduce:

1.Open newtab and load wikipedia
2.Mouse hover over padlock icon in addressbar
3. Load https://helpx.adobe.com/flash-player.html and wait for loading
4. Mouse hover over padlock icon in addressbar

Actual results:
tooltips are blank. After I tried 2-3 times, the tooltip display properly
See attached screencast

Expected Results:
tooltip should display properly

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=038ebfdd141acdc7603d2378a832a572bb267686&tochange=9644ee96a51a03a8f4e50e9777fb7278f246383c

So, Bug 1492582 is culprit

I can also reproduce the issue on Nightly72.0a1 on Ubuntu18.04

Hey Alice,
I can also reproduce this on Windows 10 x64. Let's move it over to a component to get this issue tracked.

Otherwise code like StyleChildrenIterator won't find it, plus it is the right
thing to do anyway.

You don't really want this to inherit from the root element, even though given
this content is under our control (only in chrome documents) it is less of an
issue.

Hopefully you don't mind me stealing this Brendan :)

https://treeherder.mozilla.org/#/jobs?repo=try&revision=1cf8b7a3fb682520d53ff705ce681c0914aa2208

Unfortunately, I can still reproduce the issue with that patch.

1. Open firefox
2. add new tab
3. open https://www.mozilla.org/en-US/privacy/firefox/
4. hover over lock icon until tooltip shows
5. click back to first tab
6. load https://helpx.adobe.com/flash-player.html (while that loads keep moving your mouse around in the browser chrome)
7. when the manage plugin icon appears, mouse over that

Like Alice noted, if you move around between tooltips they'll start working correctly again. Though you can re-break them, by repeating steps 2-7 again.

Blerg, silly mistake, fixed. Sanity-checking it actually fixes it appreciated, you seem to be able to repro much more consistently than me :)

https://hg.mozilla.org/mozilla-central/rev/46b6fba8836f

Let's uplift once this is verified in nightly.

Reproduced once more on affected Beta 72.0b7 (64-bit) on Windows 10 and Ubuntu 18.04.
Verified-fixed on Firefox Nightly 73.0a1 (2019-12-16) (64-bit) on Windows 10 and Ubuntu 18.04
Waiting for uplift to Beta.

Comment on attachment 9115015 [details]
Bug 1598841 - nsCanvasFrame anonymous content needs to be document-level. r=bdahl

Beta/Release Uplift Approval Request

• User impact if declined: see comment 0
• Is this code covered by automated tests?: No
• Has the fix been verified in Nightly?: Yes
• Needs manual test from QE?: Yes
• If yes, steps to reproduce: comment 0
• List of other uplifts needed: none
• Risk to taking this patch: Low
• Why is the change risky/not risky? (and alternatives if risky): Straight-forward change.
• String changes made/needed: none

Comment on attachment 9115015 [details]
Bug 1598841 - nsCanvasFrame anonymous content needs to be document-level. r=bdahl

regression fix affecting the address bar, verified in nightly, approved for 72.0b8

https://hg.mozilla.org/releases/mozilla-beta/rev/35f53344c92d

Reproduced the issue on Beta 72.0b7 (Build id: 20191213132525) on Windows 10 and Ubuntu 18.04.
Verified-fixed on latest Beta 72.0b11 (Build id: 20191227034945) using Windows 10 and Ubuntu 18.04.