Fixing firefox bug

source/stylesheets/landing.css

@@ -706,12 +706,12 @@
     }
     .testimonial-news img {
-      -webkit-filter: grayscale(100%);
-      -moz-filter: grayscale(100%);
-      -ms-filter: grayscale(100%);
-      -o-filter: grayscale(100%);
-      filter: grayscale(100%);
-      filter: url(grayscale.svg); /* Firefox 4+ */
+      -webkit-filter: grayscale(85%);
+      -moz-filter: grayscale(85%);
+      -ms-filter: grayscale(85%);
+      -o-filter: grayscale(85%);
+      filter: grayscale(85%);
+      filter: filter: grayscale(85%); /* Firefox 4+ */
       filter: gray; /* IE 6-9 */;
       transition: 0.2s ease;
     }