2 files changed, 13 insertions, 0 deletions
diff --git a/ext/fg/frame.html b/ext/fg/frame.html
index 8246787b..b098a42d 100644
--- a/ext/fg/frame.html
+++ b/ext/fg/frame.html
@@ -13,6 +13,7 @@
         <div class="content"></div>
 
         <script src="../lib/jquery-2.2.2.min.js"></script>
+        <script src="js/gecko.js"></script>
         <script src="js/util.js"></script>
         <script src="js/frame.js"></script>
     </body>
diff --git a/ext/fg/js/gecko.js b/ext/fg/js/gecko.js
new file mode 100644
index 00000000..21671749
--- /dev/null
+++ b/ext/fg/js/gecko.js
@@ -0,0 +1,12 @@
+if (!document.caretRangeFromPoint){
+    document.caretRangeFromPoint = function polyfillcaretRangeFromPoint(x,y){
+        let range = document.createRange();
+        let position = document.caretPositionFromPoint(x,y);
+        if (!position) {
+            return null;
+        }
+        range.setStart(position.offsetNode, position.offset);
+        range.setEnd(position.offsetNode, position.offset);
+        return range;
+    };
+}