diff --git a/browser/app/profile/firefox.js b/browser/app/profile/firefox.js
index a7d7b2b19538..0c1ce125d6f7 100644
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -1379,9 +1379,6 @@ pref("security.insecure_connection_text.pbmode.enabled", false);
 pref("security.cert_pinning.enforcement_level", 1);
 
 
-// Override the Gecko-default value of false for Firefox.
-pref("plain_text.wrap_long_lines", true);
-
 // If this turns true, Moz*Gesture events are not called stopPropagation()
 // before content.
 pref("dom.debug.propagate_gesture_events_through_content", false);
diff --git a/dom/base/test/reftest/reftest.list b/dom/base/test/reftest/reftest.list
index 0ea2f2cc1057..8aa3f3b94924 100644
--- a/dom/base/test/reftest/reftest.list
+++ b/dom/base/test/reftest/reftest.list
@@ -4,4 +4,4 @@ HTTP == test_xmlPrettyPrint_csp.xml test_xmlPrettyPrint_csp-ref.xml
 # size of the reftest document. This test however needs something more representative
 # of a real mobile device, where the desktop viewport width doesn't match the
 # width of the device screen.
-test-pref(dom.meta-viewport.enabled,true) test-pref(browser.viewport.desktopWidth,1200) test-pref(plain_text.wrap_long_lines,true) == test_bug1525662.txt test_bug1525662-ref.html
+test-pref(dom.meta-viewport.enabled,true) test-pref(browser.viewport.desktopWidth,1200) == test_bug1525662.txt test_bug1525662-ref.html
diff --git a/mobile/android/app/mobile.js b/mobile/android/app/mobile.js
index aa0cc8e66b30..321b4282151b 100644
--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -366,9 +366,6 @@ pref("browser.ui.zoom.force-user-scalable", false);
 // With the typical screen sizes on mobile devices, we want to wrap page sources by default.
 pref("view_source.wrap_long_lines", true);
 
-// Ditto for plain text documents.
-pref("plain_text.wrap_long_lines", true);
-
 
 pref("ui.touch.radius.enabled", false);
 pref("ui.touch.radius.leftmm", 3);