[Affected versions]: - 63.0b3, 64.0b10, 65.0a1 (2018-11-20) [Affected platforms]: - win10x64 [Steps to reproduce]: 1. Launch Firefox; 2. Access about:addons 3. Click on the Plugins section; 4. Press the TAB key until [Ask to activate] is brought into focus; 5. Click on that button; 6. Click on any plugin from the list; [Expected result]: - the dropdown menu is displayed properly; [Actual result]: - the button expands a few pixels on tab_focus; * steps 4-5: the Options button is pushed to the left; - issues encountered for the buttons with this format(in both sections at step 4 and 6) [Regression range]: - checking for regression I considered the width issue as bad for the button at step 6, in between there where versions in which the buttons on steps 4-5 appeared to not have this issue; - bug 1498632 appears to be at fault; [Additional notes]: - attached screen capture with issue; - issue is best visible for steps 4+5; - macOS(10.13) and Ubuntu(16.04) are not affected by this issue; - around 63.0a1(20180801223951) the text shifted on clicks, but that might be intended for UX;

Hey Emilio, mind confirming if this is the case? Thank you!

Looks really unlikely given my patch affects only input[type="date"] and input[type="time"], and is a CSS-only change.

Rechecked with mozregression and it had the same result. For the buttons at steps 4-5 - last good: 2018-10-15 changeset: 4c11ab0cd98950983cfc957f579ace6c3e918a43 - first bad: 2018-10-19 changeset: 9e9ca4e2ef17b85d0e49979049b227f3bd9915b1

when running mozregression on this issue, i land on bug 1471544 as having introduced the behaviour.

Not sure why this introduced the regression, but an outline seems the right way of styling this.

Pushed by paolo.mozmail@amadzone.org: https://hg.mozilla.org/integration/mozilla-inbound/rev/7968f626961d Fix menulist focus outline on Windows. r=dao

Verified with 65.0a1 (2018-11-22) - Windows 10x64. Issue is no longer reproducible on both the buttons from step 4 and 6.

Did you want to request Beta approval on this, Paolo?

I don't know, but maybe not, given this is minor enough, and there's a small chance of styling regression somewhere else.

Fx64 RC week is next week, so let's let this ride the trains then. Thanks!