Conditionalize the navigator IE8 check.

This caused a problem in gecko, where the jsm runs in an environment without access to the navigator object.
mozilla · Dec 1, 2015 · 58d0924 · 58d0924
1 parent 6c4fe04
commit 58d0924
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/lib/vtt.js b/lib/vtt.js
@@ -716,7 +716,8 @@
   // Constructs the computed display state of the cue (a div). Places the div
   // into the overlay which should be a block level element (usually a div).
   function CueStyleBox(window, cue, styleOptions) {
-    var isIE8 = (/MSIE\s8\.0/).test(navigator.userAgent);
+    var isIE8 = (typeof navigator !== "undefined") &&
+      (/MSIE\s8\.0/).test(navigator.userAgent);
     var color = "rgba(255, 255, 255, 1)";
     var backgroundColor = "rgba(0, 0, 0, 0.8)";