--- a/browser/components/search/content/search.xml
+++ b/browser/components/search/content/search.xml
@@ -1695,18 +1695,18 @@
           let button = document.createElementNS(kXULNS, eltType);
           button.classList.add("addengine-item");
           button.id = this.telemetryOrigin + "-add-engine-" +
                       this._fixUpEngineNameForID(engine.title);
           let label = this.bundle.formatStringFromName("cmd_addFoundEngine",
                                                        [engine.title], 1);
           button.setAttribute("label", label);
           button.setAttribute("crop", "end");
-          button.setAttribute("tooltiptext", engine.uri);
           button.setAttribute("tooltiptext", engine.title + "\n" + engine.uri);
+          button.setAttribute("uri", engine.uri);
           button.setAttribute("title", engine.title);
           if (engine.icon) {
             button.setAttribute("image", engine.icon);
           }
           if (tooManyEngines) {
             button.classList.add("menuitem-iconic");
           } else {
             button.setAttribute("pack", "start");