diff --git a/browser/branding/official-linux-beta/content/aboutDialog.css b/browser/branding/official-linux-beta/content/aboutDialog.css
index 286e7c6186..256ee1daac 100644
--- a/browser/branding/official-linux-beta/content/aboutDialog.css
+++ b/browser/branding/official-linux-beta/content/aboutDialog.css
@@ -5,6 +5,7 @@
       -moz-appearance:none!important;
       background-image: url("chrome://branding/content/about-background.jpg");
       brackground-color:#333!important;
+	  background-size: 100% 100%!important;
 }
 
 #clientBox {
diff --git a/browser/branding/official-linux/content/aboutDialog.css b/browser/branding/official-linux/content/aboutDialog.css
index cea56db2be..b4bd6ff559 100644
--- a/browser/branding/official-linux/content/aboutDialog.css
+++ b/browser/branding/official-linux/content/aboutDialog.css
@@ -5,6 +5,7 @@
 	  -moz-appearance:none!important;
       background-image: url("chrome://branding/content/about-background.jpg");
 	  brackground-color:#333!important;
+	  background-size: 100% 100%!important;
 }
 #clientBox {
   color: #FFF;