IE 11 is not compatible with this extension it would appear, I get the following error:
Object doesn't support property or method 'includes'
And the line that the browser highlights is:
u.a.component({type:"social social-settings",icon:"fas fa-cog",label:app.translator.trans("fof-socialprofile.forum.edit.edit"),onclick:function(){app.modal.show(new E({user:o.props.user}))}}),-1):this.canEdit&&t.add("settings social-button",u.a.component({type:"social social-moderate "+(this.deleting?"social-moderate--highlighted":""),icon:"fas fa-exclamation-triangle",label:app.translator.trans("fof-socialprofile.forum.edit.delete"),onclick:function(){o.deleting=!o.deleting}}),-1)):this.isSelf&&t.add("settings social-button",u.a.component({type:"social null-social-settings",icon:"fas fa-plus",label:app.translator.trans("fof-socialprofile.forum.edit.add"),onclick:function(){app.modal.show(new E({user:o.props.user}))}}),-1)})})}]);
I discovered this when I was attempting to debug a different issue.