diff --git a/components/style/properties/gecko.mako.rs b/components/style/properties/gecko.mako.rs
index eff22c710d7..2a7700faa6d 100644
--- a/components/style/properties/gecko.mako.rs
+++ b/components/style/properties/gecko.mako.rs
@@ -1563,6 +1563,23 @@ fn static_assert() {
         }
     }
 
+    pub fn clone_font_feature_settings(&self) -> longhands::font_feature_settings::computed_value::T {
+        use values::generics::{FontSettings, FontSettingTag, FontSettingTagInt} ;
+
+        if self.gecko.mFont.fontFeatureSettings.len() == 0 {
+            FontSettings::Normal
+        } else {
+            FontSettings::Tag(
+                self.gecko.mFont.fontFeatureSettings.iter().map(|gecko_font_feature_setting| {
+                    FontSettingTag {
+                        tag: gecko_font_feature_setting.mTag,
+                        value: FontSettingTagInt(gecko_font_feature_setting.mValue),
+                    }
+                }).collect()
+            )
+        }
+    }
+
     pub fn set_font_variation_settings(&mut self, v: longhands::font_variation_settings::computed_value::T) {
         use values::generics::FontSettings;
 
@@ -1640,6 +1657,34 @@ fn static_assert() {
         self.gecko.mGenericID = other.gecko.mGenericID;
     }
 
+    pub fn clone_font_family(&self) -> longhands::font_family::computed_value::T {
+        use properties::longhands::font_family::computed_value::{FontFamily, FamilyName};
+        use gecko_bindings::structs::FontFamilyType;
+        use gecko_string_cache::Atom;
+
+        ::properties::longhands::font_family::computed_value::T(
+            self.gecko.mFont.fontlist.mFontlist.iter().map(|gecko_font_family_name| {
+                match gecko_font_family_name.mType {
+                    FontFamilyType::eFamily_serif => FontFamily::Generic(atom!("serif")),
+                    FontFamilyType::eFamily_sans_serif => FontFamily::Generic(atom!("sans-serif")),
+                    FontFamilyType::eFamily_monospace => FontFamily::Generic(atom!("monospace")),
+                    FontFamilyType::eFamily_cursive => FontFamily::Generic(atom!("cursive")),
+                    FontFamilyType::eFamily_fantasy => FontFamily::Generic(atom!("fantasy")),
+                    FontFamilyType::eFamily_moz_fixed => FontFamily::Generic(Atom::from("-moz-fixed")),
+                    FontFamilyType::eFamily_named => FontFamily::FamilyName(FamilyName {
+                        name: (&*gecko_font_family_name.mName).into(),
+                        quoted: false
+                    }),
+                    FontFamilyType::eFamily_named_quoted => FontFamily::FamilyName(FamilyName {
+                        name: (&*gecko_font_family_name.mName).into(),
+                        quoted: true
+                    }),
+                    x => panic!("Found unexpected font FontFamilyType: {:?}", x),
+                }
+            }).collect()
+        )
+    }
+
     // FIXME(bholley): Gecko has two different sizes, one of which (mSize) is the
     // actual computed size, and the other of which (mFont.size) is the 'display
     // size' which takes font zooming into account. We don't handle font zooming yet.
diff --git a/components/style/properties/longhand/font.mako.rs b/components/style/properties/longhand/font.mako.rs
index 1202d5fdced..d0a66f006f2 100644
--- a/components/style/properties/longhand/font.mako.rs
+++ b/components/style/properties/longhand/font.mako.rs
@@ -78,7 +78,7 @@ macro_rules! impl_gecko_keyword_from_trait {
     }
 </%def>
 
-<%helpers:longhand name="font-family" animation_value_type="none" need_index="True"  boxed="${product == 'gecko'}"
+<%helpers:longhand name="font-family" animation_value_type="discrete" need_index="True"  boxed="${product == 'gecko'}"
                    spec="https://drafts.csswg.org/css-fonts/#propdef-font-family">
     use properties::longhands::system_font::SystemFont;
     use self::computed_value::{FontFamily, FamilyName};
@@ -1941,7 +1941,7 @@ ${helpers.single_keyword_system("font-variant-position",
                                 spec="https://drafts.csswg.org/css-fonts/#propdef-font-variant-position",
                                 animation_value_type="discrete")}
 
-<%helpers:longhand name="font-feature-settings" products="gecko" animation_value_type="none"
+<%helpers:longhand name="font-feature-settings" products="gecko" animation_value_type="discrete"
                    extra_prefixes="moz" boxed="True"
                    spec="https://drafts.csswg.org/css-fonts/#propdef-font-feature-settings">
     use properties::longhands::system_font::SystemFont;