1491675 - On right-click release, contextual menu registers an onclick event

Status: RESOLVED DUPLICATE of bug 1344526

(Firefox :: Untriaged, defect)

Description

[philippe]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:63.0) Gecko/20100101 Firefox/63.0
Build ID: 20180913141435

Steps to reproduce:

Firefox Version: 63 (Developer and Nightly, don't have the normal version), last build (downloaded 2018-09-16)
OS : MacOS High Sierra 10.13.6
Mouse: Magic Mouse 2

1. Open a browser page
2. Right-click anywhere in the window
3. Release the right-click after you have hovered an element of the contextual menu
4. The menu will register this as a click event and run the command in the contextual menu that was hovered


Actual results:

Right-click release (onmouseup) triggers contextual menu option as if a onclick (onmousedown + onmouseup) event.

When performing speedy operations, it is easy to move the mouse onto the menu before releasing the right-click button, thus oftentimes resulting in clicking on the previous button. Results in a really confusing/angering UX experience.


Expected results:

Right click release should not result in anything on the contextual menu