This is not a bug. This is explained in the bug reporting guidelines:
https://wiki.ubuntu.com/MozillaTeam/Bugs#No_context_menu_available_in_the_global_menubar_.2BAC8_can.27t_manage_bookmarks_using_the_global_menubar
** Changed in: firefox (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1058410
Title:
Cannot delete Firefox bookmarks by right-clicking them
Status in One Hundred Paper Cuts:
New
Status in “firefox” package in Ubuntu:
Invalid
Bug description:
Using Firefox 15.01 under Linux 12.04 with the Unity interface
When right-clicking a bookmark to delete it, it automaticly opens a
new tab, as if left-clicking it.
Further research shows that this can be solved by disabling the Global
Menu Bar Integration 3.4 in the extension menu, so the issue seems to
be Unity
To manage notifications about this bug go to:
https://bugs.launchpad.net/hundredpapercuts/+bug/1058410/+subscriptions
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