diff --git a/b2g/app/b2g.js b/b2g/app/b2g.js
index ba51a559fb8f..210f7a334c8e 100644
--- a/b2g/app/b2g.js
+++ b/b2g/app/b2g.js
@@ -34,6 +34,9 @@ pref("browser.tabs.remote.autostart.1", false);
 // Bug 945235: Prevent all bars to be considered visible:
 pref("toolkit.defaultChromeFeatures", "chrome,dialog=no,close,resizable,scrollbars,extrachrome");
 
+// Disable focus rings
+pref("browser.display.focus_ring_width", 0);
+
 // Device pixel to CSS px ratio, in percent. Set to -1 to calculate based on display density.
 pref("browser.viewport.scaleRatio", -1);
 
diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index 68504c8f018d..573f671dd3b0 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -1356,8 +1356,8 @@ skip-if(B2G&&browserIsRemote) == 486848-1.xul 486848-1-ref.xul # bug 974780
 == 490177-1.svg 490177-1-ref.svg
 == 490182-1a.html 490182-1-ref.html
 == 490182-1b.html 490182-1-ref.html
-== 491180-1.html 491180-1-ref.html
-== 491180-2.html 491180-2-ref.html
+pref(browser.display.focus_ring_width,1) == 491180-1.html 491180-1-ref.html
+pref(browser.display.focus_ring_width,1) == 491180-2.html 491180-2-ref.html
 skip-if(B2G&&browserIsRemote) == 491323-1.xul 491323-1-ref.xul # bug 974780
 skip-if(B2G&&browserIsRemote) == 492239-1.xul 492239-1-ref.xul # bug 974780
 == 492661-1.html 492661-1-ref.html
diff --git a/layout/reftests/forms/button/reftest.list b/layout/reftests/forms/button/reftest.list
index 2dd417fc244a..b57f1c0685bf 100644
--- a/layout/reftests/forms/button/reftest.list
+++ b/layout/reftests/forms/button/reftest.list
@@ -7,9 +7,9 @@
 # on B2G, despite their "-moz-appearance: none; background: gray", so they
 # don't quite match the reference case's normal <div>. That's why they're fuzzy.
 fuzzy-if(B2G||Android,125,20) == percent-height-child-1.html percent-height-child-1-ref.html
-fuzzy-if(B2G||Android,125,80) == percent-height-child-2.html percent-height-child-2-ref.html
+pref(browser.display.focus_ring_width,1) fuzzy-if(B2G||Android,125,80) == percent-height-child-2.html percent-height-child-2-ref.html
 fuzzy-if(B2G||Android,125,20) == percent-width-child-1.html  percent-width-child-1-ref.html
-fuzzy-if(B2G||Android,125,80) == percent-width-child-2.html  percent-width-child-2-ref.html
+pref(browser.display.focus_ring_width,1) fuzzy-if(B2G||Android,125,80) == percent-width-child-2.html  percent-width-child-2-ref.html
 
 == vertical-centering.html vertical-centering-ref.html