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On 2018-10-16T10:43:47+00:00 Pedro Côrte-Real wrote:

Created attachment 9017453
Screenshot of the first issue

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0)
Gecko/20100101 Firefox/62.0

Steps to reproduce:

I can reproduce this frequently but not yet on command. What I'm doing
is normal usage:

- Entering data into the location bar which dropdowns the list of options
- Using the right click and mouseover to open tooltips and dropdown menus on 

I'm using gnome-shell 3.28.3-0ubuntu0.18.04.2 on Ubuntu 18.04. Firefox
is 62.0.3+build1-0ubuntu0.18.04.1. I've had the issue happen in all
versions of firefox and gnome shell in Ubuntu 18.04 so far. I did a
small test with Unity and couldn't reproduce the issue yet but since it
doesn't happen 100% of the time longer testing would be required to make
sure it's a gnome-shell specific issue.

Actual results:

Two things are happening that may be separate bugs or not:

- When using an external screen placed on top of the internal one with
firefox maximized on the internal screen the URL bar's dropdown would
consistently appear on the external screen, completely outside the
firefox window, instead of the normal location. Screenshot is attached.

- In what appears to be random chance tooltips and menus are often
misplaced on screen. It's common but not fully reproducible. What I see
is right-clicking an element on a page or hovering over a link and
having the menu/tooltip show up somewhere different on the page. Doing
it again immediately after often results in it appearing in the right
place the second time. I haven't gotten a screenshot yet.

Expected results:

- The dropdown appearing right below the URL bar
- The menus and tooltips appearing at the mouse location

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On 2018-10-19T12:07:32+00:00 Daniel-aschilean wrote:

I verified this issue on Ubuntu 18.04 with FF 64.0a1 (2018-10-19) (64-bit) and 
I cannot reproduce it. 
Can you please test this in safe mode? Here is a link that can help you:
I think it will be a good idea to retest this on the latest Firefox Nightly. 
Here is a link form where you can download it: 
If you still have the issue please create a new profile, you have the steps 

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On 2018-10-19T15:19:12+00:00 Pedro Côrte-Real wrote:

It's natural that you can't reproduce this at will. I can't either.
Unfortunately the sequence of steps needed to reproduce this is not yet
clear to me. I've been trying to find out what they are but don't have
any conclusions yet. With that in mind, testing different versions or
profiles is hard to do conclusively.

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On 2018-10-21T07:40:30+00:00 Sledru wrote:

*** Bug 1240552 has been marked as a duplicate of this bug. ***

Reply at:

On 2018-10-21T19:56:41+00:00 Sledru wrote:

*** Bug 763312 has been marked as a duplicate of this bug. ***

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On 2019-02-10T19:03:03+00:00 Pedro Côrte-Real wrote:

I've reproduced the issue in a new session in Firefox 65.0. I used
Firefox sync to get my stuff over. Testing with a fully empty session is
harder because I need bookmarks and other stuff to be able to use the
browser and this doesn't happen at will.

Reply at:

** Changed in: firefox
       Status: Unknown => Confirmed

** Changed in: firefox
   Importance: Unknown => Medium

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  Menus, tooltips and dropdowns are often misplaced on screen

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