1476585 - Dropdowns are overlaid on Facebook

Status: RESOLVED WORKSFORME

(Core :: DOM: Events, defect, P3)

Description

[Daniel_A[:daschilean] [Please contact - [e-mail]]]

Attachment: dropdows.JPG

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0 
Build ID: 20180718100918 

[Affected versions]:
Nightly 63.0a1, FF 62.0b9 (64-bit)

[Affected platforms]:
Windows 10 x64, Ubuntu 16.04 x64, Mac 10.13

[Steps to reproduce]:
1.Launch Firefox with a new profile
2.Navigate to facebook.com and login
3.Go to the Facebook top bar menu  
4.Press Middle-click on "Friend Requests", "Messages" and "Notifications"

[Expected result]:
The selected tab should display only own dropdown.

[Actual result]:
Multiple dropdowns are overlaid.

Comment 1

[Andrew Overholt [:overholt]]

Is this unique to Firefox? (I mean, are we sure this isn't a Facebook bug?)

Comment 2

[Daniel_A[:daschilean] [Please contact - [e-mail]]]

Hi Andrew,

Yes, this behavior is displayed only on Firefox. I tested this issue on different browsers.

Comment 3

[Andrew Overholt [:overholt]]

Hmm, I can't reproduce in nightly on Windows 10. I guess we're being served different content from Facebook.

Comment 4

[Andreas Farre [:farre]]

This reproduces easily on Firefox, Nightly and Release, on both Linux and Windows 10 (note the middle click). Running mozregression this reproduces way back to 2012-08-10 and before that we have some issues accepting cookies which I think makes us not get scripts running on the site at all (which actually makes it work).

On thing to consider perhaps:

<script>
  onclick = e => console.log(e)
</script>

reveals that we capture both left mb and middle mb, but neither Chrome nor Edge dispatches an event on the middle mouse button.

Comment 5

[Andrew Overholt [:overholt]]

(In reply to Andrew Overholt [:overholt] from comment #3)
> Hmm, I can't reproduce in nightly on Windows 10. I guess we're being served
> different content from Facebook.

I don't know what was happening that day but I can reproduce it now :)

Comment 6

[Andrew Overholt [:overholt]]

Olli and I have been talking about middle mouse buttons a bit as of late so I'll needinfo him here to see if he has thoughts. In general, though, I agree with the P3 designation as I doubt enough people have middle mouse buttons or use them to make this a priority.

Comment 7

[Olli Pettay [:smaug][[e-mail]]]

I just don't think I'll have time for this any time soon.
p3 or event p5. p3 is ok.

Comment 8

[Alin Ilea, Desktop QA]

Hi,

I've tested this issue on Windows 10 x64, Windows 7 x64, Ubuntu 18.04 and Mac OS X 10.14 on the latest Nightly 68.0a1(2019-05-07) and I'm not able to reproduce the problem. Based on that I will mark the issue as Resolved WFM.