While technically I probably ought to click Restart Now more often, if I'm in the midst of something and I ignore it and Command-Tab to a different application, the popup dialog remains *on top of* all other applications until I resolve it. This is, technically, good for nightly updating, but pragmatically very unfriendly to users doing more than one thing with their computer. I'm on OS X 10.13.1 Beta (17B45a) and have seen this in Nightly a couple days this week so far. I suspect it started a few days ago, but I'm not entirely sure.
Doug, do you recall this issue on OS X?
I've only ever seen that while I have the "Disable popup auto hide" option active in the browser toolbox. I believe the pref is "ui.popup.disable_autohide". Richard, is that pref set for you?
(In reply to Doug Thayer [:dthayer] from comment #2) > I've only ever seen that while I have the "Disable popup auto hide" option > active in the browser toolbox. I believe the pref is > "ui.popup.disable_autohide". Richard, is that pref set for you? It's unmodified/default, it says 'false' right now in non-bold.
Created attachment 8925063 [details] Video of the problem on Nightly this morning. Nightly 2017-11-02, OS X 10.13.2 Beta (17C60c).
I was no longer able to reproduce this in yesterday's nightly updating this morning, but I can't say why it changed.