browser(firefox): roll Firefox to r1171 (#3818)

aslushnikov · web-flow · commit 8a339be24dba · 2020-09-09T14:00:06.000-07:00
Fixes #3470
diff --git a/browsers.json b/browsers.json
@@ -8,7 +8,7 @@
     },
     {
       "name": "firefox",
-      "revision": "1169",
+      "revision": "1171",
       "download": true
     },
     {
