In MW 1.22.10 + IE11 textselection plugin in wysiwyg->wikitext direction does not work. Because extension is enabled and wysiwyg->wikitext direction works with FF and Chrome, bookmarks are left in wikitext code with IE, so remove these: <span data-cke-bookmark="1" style="display: none;" id="cke_bm_190c">&nbsp;</span>. In case texselection plugin is fixed to work with MW and IE then this should be removed. MW1.23.3 + IE11 does not have this bookmark problem.