--- a/gfx/thebes/gfxUserFontSet.cpp
+++ b/gfx/thebes/gfxUserFontSet.cpp
@@ -124,18 +124,17 @@ gfxUserFontEntry::gfxUserFontEntry(gfxUs
     mSrcList = aFontFaceSrcList;
     mSrcIndex = 0;
     mWeight = aWeight;
     mStretch = aStretch;
     mStyle = aStyle;
     mFeatureSettings.AppendElements(aFeatureSettings);
     mLanguageOverride = aLanguageOverride;
 
-    if (aUnicodeRanges &&
-        Preferences::GetBool("layout.css.unicode-range.enabled")) {
+    if (aUnicodeRanges) {
         mCharacterMap = new gfxCharacterMap(*aUnicodeRanges);
     }
 }
 
 gfxUserFontEntry::~gfxUserFontEntry()
 {
 }
 

--- a/layout/reftests/font-face/reftest.list
+++ b/layout/reftests/font-face/reftest.list
@@ -45,31 +45,31 @@ skip HTTP(..) == src-list-local-localize
 
 # postscript name lookup
 # fontconfig only supports postscript name lookup from 2.10.92, Android/B2G not supported
 skip-if(B2G||Mulet) fails-if(Android) random-if(gtkWidget) == src-list-local-ps.html src-list-local-full-ref.html # bug 773482
 # Mac-specific test of 100 weight faces
 random-if(!cocoaWidget) == helveticaneue-ultra.html helveticaneue-ultra-ref.html
 
 HTTP(..) == order-1.html order-1-ref.html
-pref(layout.css.unicode-range.enabled,true) HTTP(..) == order-2.html order-2-ref.html
-pref(layout.css.unicode-range.enabled,true) HTTP(..) == order-3.html order-3-ref.html
+HTTP(..) == order-2.html order-2-ref.html
+HTTP(..) == order-3.html order-3-ref.html
 HTTP(..) == multiple-in-family-1.html multiple-in-family-1-ref.html
 HTTP(..) == multiple-in-family-1b.html multiple-in-family-1-ref.html
 HTTP(..) != multiple-in-family-1.html multiple-in-family-1-notref.html
 HTTP(..) == prop-order-over-rule-order-1a.html prop-order-over-rule-order-2a.html
 HTTP(..) == prop-order-over-rule-order-1b.html prop-order-over-rule-order-2b.html
 HTTP(..) != prop-order-over-rule-order-1a.html prop-order-over-rule-order-1b.html
 skip-if(B2G||Mulet) HTTP(..) == cross-iframe-1.html cross-iframe-1-ref.html # bug 773482 # Initial mulet triage: parity with B2G/B2G Desktop
 
 # unicode-range
-pref(layout.css.unicode-range.enabled,true) HTTP(..) == unicoderange-1.html unicoderange-1-ref.html
-pref(layout.css.unicode-range.enabled,true) HTTP(..) == unicoderange-2.html unicoderange-2-ref.html
-pref(layout.css.unicode-range.enabled,true) HTTP(..) == unicoderange-3.html unicoderange-3-ref.html
-pref(layout.css.unicode-range.enabled,true) HTTP(..) == unicoderange-4.html unicoderange-4-ref.html
+HTTP(..) == unicoderange-1.html unicoderange-1-ref.html
+HTTP(..) == unicoderange-2.html unicoderange-2-ref.html
+HTTP(..) == unicoderange-3.html unicoderange-3-ref.html
+HTTP(..) == unicoderange-4.html unicoderange-4-ref.html
 
 # Dynamic changes
 # we need to skip these because of the bug that's causing order-2.html to fail
 HTTP(..) == enable-sheet-1.html enable-sheet-1-ref.html
 skip HTTP(..) == enable-sheet-2.html multiple-in-family-1-ref.html
 skip HTTP(..) == enable-sheet-3.html multiple-in-family-1-ref.html
 HTTP(..) == enable-sheet-4.html enable-sheet-4-ref.html
 HTTP(..) == enable-sheet-5.html enable-sheet-4-ref.html

--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -2292,23 +2292,16 @@ pref("layout.css.getBoxQuads.enabled", t
 
 // Is support for GeometryUtils.convert*FromNode enabled?
 #ifdef RELEASE_BUILD
 pref("layout.css.convertFromNode.enabled", false);
 #else
 pref("layout.css.convertFromNode.enabled", true);
 #endif
 
-// Is support for unicode-range enabled?
-#ifdef RELEASE_BUILD
-pref("layout.css.unicode-range.enabled", false);
-#else
-pref("layout.css.unicode-range.enabled", true);
-#endif
-
 // Is support for CSS "text-align: true X" enabled?
 pref("layout.css.text-align-true-value.enabled", false);
 
 // Is support for CSS "float: inline-{start,end}" and
 // "clear: inline-{start,end}" enabled?
 #if defined(MOZ_B2G) || defined(NIGHTLY_BUILD)
 pref("layout.css.float-logical-values.enabled", true);
 #else

--- a/testing/profiles/prefs_general.js
+++ b/testing/profiles/prefs_general.js
@@ -156,19 +156,16 @@ user_pref("layout.css.grid.enabled", tru
 user_pref("layout.css.contain.enabled", true);
 
 // Enable CSS object-fit & object-position for testing
 user_pref("layout.css.object-fit-and-position.enabled", true);
 
 // Enable CSS Ruby for testing
 user_pref("layout.css.ruby.enabled", true);
 
-// Enable unicode-range for testing
-user_pref("layout.css.unicode-range.enabled", true);
-
 // Enable webkit prefixed CSS features for testing
 user_pref("layout.css.prefixes.webkit", true);
 
 // Disable spammy layout warnings because they pollute test logs
 user_pref("layout.spammy_warnings.enabled", false);
 
 // Enable Media Source Extensions for testing
 user_pref("media.mediasource.mp4.enabled", true);