Pale Moon Displays Entire Context Menu When Limited Menu Is Expected

[ascii_elite]

Pale Moon may display the entire context menu instead of the limited context menu when right clicking on a part of a webpage.

EDIT: It appears that cookies or a cookie may need to be present to manifest the problem. I have adjusted the reproduction procedure to account for this.

To reproduce the problem, do the following:
[*]Browse to: https://www.myprime.com/en/forms.html[/s]
[*]Browse to: http://www.bcbsil.com/medicare/mapd_forms.html
[*]Locate the hyperlink labeled "Pharmacy Mail-Order Form" in the "Prescription Drug Forms" section (the second section from the top) from the large table of the page.
[*]Click the hyperlink.
[*]After page loads and an area with overlaid forms labeled "Select your health plan" appears, right-click in the area outside the "Select your health plan" area's rectangle.

Prerequisite:
Context area should be large enough to be able to right click outside the "Select your health plan" rectangle described is the second fourth step to reproduce the problem. My test window was 982 x 793 pixels.
Cookies should be enabled.

The bug is also present on Firefox 24.8.1.

I am using Pale Moon 26.2.2 on Windows XP Professional with Service Pack 3.

I have attached a screenshot illustrating the problem.

[New Tobin Paradigm]

This indicates that something which ties into the context menu has failed thus preventing filtering of context menu options.. Perhaps an extension. However, I am not able to reproduce the issue my self.

[ascii_elite]

This indicates that something which ties into the context menu has failed thus preventing filtering of context menu options.. Perhaps an extension. However, I am not able to reproduce the issue my self.

I also tested Pale Moon in its Safe Mode (without extensions) and the problem still manifested.

[ascii_elite]

I am not able to reproduce the issue my self.

I believe that a cookie or cookies may need to be present. I have adjusted the reproduction procedure to account for this. Please try to reproduce the issue again.

[New Tobin Paradigm]

I don't block cookies.. or pull any of that nonsense.. I also tested with my normal profile and a default one.. I cannot reproduce.

[Moonchild]

Check your browser/error and web consoles to see if there is an error thrown there when you open the context menu.
I can't reproduce this issue either following the STR. The context menu is perfectly fine.

[ascii_elite]

Check your browser/error and web consoles to see if there is an error thrown there when you open the context menu.
I can't reproduce this issue either following the STR. The context menu is perfectly fine.

Yes, there is indeed an error. When the right-click action occurs and the context menu is generated, the following error is reported:

Timestamp: 5/14/2016 6:31:03 AM
Error: NS_ERROR_NOT_INITIALIZED: Component returned failure code: 0xc1f30001 (NS_ERROR_NOT_INITIALIZED) [nsIEditor.selection]
Source File: chrome://browser/content/browser.js
Line: 11158

After the context menu is canceled, the following error is generated:

Timestamp: 5/14/2016 6:31:05 AM
Error: TypeError: gContextMenu is null
Source File: chrome://browser/content/browser.xul
Line: 1

No other console information is generated with regards to the menu display or canceling.