The function, openGroupBookmark, that made use of loadGroup, replaceGroup, appendGroup, goBackGroup, goForward and browser.tabs.loadGroup was removed around the time of SM 2.1/2.2 so we should get rid of the dead code in tabbrowser.xml
Bug 1607023 Comment 0 Edit History
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The function, openGroupBookmark, that made use of loadGroup, replaceGroup, appendGroup, goBackGroup, goForward and browser.tabs.loadGroup was removed around the time of SM 2.1/2.2 so we should get rid of that code that is no longer used in tabbrowser.xml