If I get it right, then Thunderbird crashes once you click on the Enigmail menu (or try to open it somehow? What I can see is that the last function called in Enigmail is collapseAdvanced(). That's a function that dynamically displays or hides certain menu entries just before the menu is displayed. Enigmail used the XUL `element.collapse()` function for this.
Bug 1622852 Comment 2 Edit History
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If I get it right, then Thunderbird crashes once you click on the Enigmail menu or try to open it somehow? What I can see is that the last function called in Enigmail is collapseAdvanced(). That's a function that dynamically displays or hides certain menu entries just before the menu is displayed. Enigmail used the XUL `element.collapse()` function for this.