1297892 - Context menu appears on wrong monitor in multi-monitor setup

Status: RESOLVED WORKSFORME

(Firefox :: Untriaged, defect)

Description

[u52928]

Attachment: FxNG.jpg

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:51.0) Gecko/20100101 Firefox/51.0
Build ID: 20160824030337

Steps to reproduce:

With Fx in full-screen view, I right-clicked on either the Menu Bar or the Bookmarks Toolbar.


Actual results:

The context menu didn't appear on the same monitor as the Fx window. 


Expected results:

The context menu should have appeared on the same monitor as the Fx window.

Comment 1

[u52928]

The problem is probably related to my three-monitor, two graphics-card system, a Lenovo ThinkStation S20.

Tech background
I'm using a Matrox M9128 card to push an NEC PA272w monitor at 2560x1440 resolution (main monitor in the center).

I'm using a Matrox M9120 card to push two NEC 2490WUXi2 monitors at 1920x1200 (situated left and right of the main monitor).

My dpi is set to 135%.

Just for the record, I'm using the very latest versions of the drivers for my graphics cards and the monitors.
------------------------------------------------
I have to confess that I don't exactly know when the problem started; I use Fx beta as my standard browser and only check what Nightly's doing every few days.

What actually happens is hard to describe precisely in words, so I've provided links to three images.
1. http://edu-net.net/images/FxOK.jpg
2. http://edu-net.net/images/FxNG.jpg
3. http://edu-net.net/images/FXmagic.jpg

Three final comments
1. This doesn't happen with Fx beta.
2. It also doesn't happen on my other Win7x64 computer, which only has one graphics card: an nVidia QuadroFX 1800.
3. Although it's generally not a good idea, I even tried my "beta" profile with Nightly. The problem still occurs.

Comment 2

[Cosmin Muntean [:cmuntean], Ecosystem QA]

Firefox: 51.0a1, Build ID: 20160828030602
User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:51.0) Gecko/20100101 Firefox/51.0

Hi Joe,

I have tested this issue on the latest Nightly (51.0a1) build using two monitor with 1920x1080 resolution and set my dpi to 125%, but I could not reproduce it. The context menu is displayed on the main monitor. 
It seems that you have a different configuration, and considering the fact the you can not reproduce this issue on latest Firefox beta, this can be a regression. Could you please try to perform a regression http://mozilla.github.io/mozregression/? 

Also, this issue is reproducible on the latest Nightly build using a new clean profile or maybe in safe mode?

Comment 3

[u52928]

Hi Cosmin,

Thanks for your feedback. 

I've now tested it with a new profile, and the problem doesn't appear. Please excuse me that I didn't try this earlier.

I guess this means it must be one of my add-ons. 

Since this appears to be the case, please close this bug. 

Thank you very much.

Comment 4

[Cosmin Muntean [:cmuntean], Ecosystem QA]

Hi Joe,
Thanks for retesting this so quickly. Considering this I will close this issue as Resolved - Worksforme.