diff --git a/b2g/app/b2g.js b/b2g/app/b2g.js
index 6b9e24273f2..68031fc00ac 100644
--- a/b2g/app/b2g.js
+++ b/b2g/app/b2g.js
@@ -38,7 +38,6 @@
 #filter substitution
 
 pref("toolkit.defaultChromeURI", "chrome://browser/content/shell.xul");
-pref("general.useragent.compatMode.firefox", true);
 pref("browser.chromeURL", "chrome://browser/content/");
 #ifdef MOZ_OFFICIAL_BRANDING
 pref("browser.homescreenURL", "file:///system/home/homescreen.html");
diff --git a/b2g/confvars.sh b/b2g/confvars.sh
index e1e259b877d..86e1bee3d8d 100644
--- a/b2g/confvars.sh
+++ b/b2g/confvars.sh
@@ -38,7 +38,8 @@
 MOZ_APP_BASENAME=B2G
 MOZ_APP_VENDOR=Mozilla
 
-MOZ_APP_VERSION=11.0a1
+MOZ_APP_VERSION=13.0a1
+MOZ_APP_UA_NAME=Firefox
 
 MOZ_BRANDING_DIRECTORY=b2g/branding/unofficial
 MOZ_OFFICIAL_BRANDING_DIRECTORY=b2g/branding/official