[OS:] Mac OS [Versions tested upon:] 52.0a1 2017-01-17 53.0a1 2017-01-17 [Description:] Steps: 1. Open Firefox and go to imgur.com 2. Create 2 users entries 3. Go to https://imgur.com/signin (the drop down appears) 4. Click outside the browser window 5. Move the browser window [Actual Result:] The drop down remains behind. [Expected Result:] The drop down should follow input field. I was able to reproduce this only on Mac OS. Please see the attached video.

CCing Neil since he worked on a similar bug recently.

I don't see this myself, but from the video it looks like the popup is disappearing correctly then reappearing. This could be something specific to the form autocomplete. I notice you have a custom cursor effect though; are you using a regular mouse/trackpad?

Did you try with a Mac? I use a logitech mouse (a normal mouse) and I don't have any custom cursor effect.

Please test this on Firefox 51. This may be an existing bug rather than a regression.

With 51 release I can't reproduce this because the dropdown doesn't appear when you focus the page, only if you click on username field. On 52.0b1 beta I can reproduce this.

Moving this to XUL Widget, since its not a password manager specific issue. Neil, can you take a look at this?

Since I can't reproduce it, I can't really do anything about it. But as I said, it looks specific to the password autocomplete.

Too late for firefox 52, mass-wontfix.