Add HEVC support in Firefox for Linux

Author: tats-u

features-json/hevc.json

@@ -236,7 +236,7 @@
       "134":"n d #6",
       "135":"n d #6",
       "136":"n d #10",
-      "137":"n d #10"
+      "137":"n d #11"
     },
     "chrome":{
       "4":"n",
@@ -667,7 +667,8 @@
     "7":"Supported only in Nightly.",
     "8":"Enabled by default only in Nightly and can be enabled via the `media.wmf.hevc.enabled` pref in `about:config`.",
     "9":"10-bit colors are not supported.",
-    "10":"Supported for devices with hardware support (the range is the same as Edge) on Windows and macOS."
+    "10":"Supported for devices with hardware support (the range is the same as Edge) on Windows and macOS.",
+    "11":"Supported for devices with hardware support (the range is the same as Edge) on Windows, macOS and Linux."
   },
   "usage_perc_y":18.73,
   "usage_perc_a":73.79,