574987 - Menus built from a RDF template do not display correctly in FF3.6+

Status: RESOLVED INVALID

(Firefox :: Extension Compatibility, defect)

Description

[Phil]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.1.9) Gecko/20100315 Firefox/3.5.9 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.4) Gecko/20100611 Firefox/3.6.4 (.NET CLR 3.5.30729)

A menupopup element built from a RDF template will distort its ancestor menupopup elements when displayed in Firefox 3.6.

Reproducible: Always

Steps to Reproduce:
1. Create an example XUL file which builds a menu with a submenu from a RDF template.
2. Open the menu then expand the submenu.
3. Compare the outcome between Firefox 3.5 and 3.6

Actual Results:  
When the menupopup element for the submenu is displayed, it's contents are also added horizontally to the original menupopup.

Expected Results:  
The menu should look the same as it does in Firefox 3.5

The submenu should not alter the parent menu when displayed.

Comment 1

[Phil]

Attachment: Testcase

Comment 2

[Phil]

Attachment: RDF template source file for testcase

Comment 3

[Andy McKay]

Legacy extensions are no longer valid in Firefox 57, closing.