diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index d09cea5b7c9f..764adbb369a9 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -8466,14 +8466,14 @@
 # Is support for color-mix on content enabled?
 - name: layout.css.color-mix.enabled
   type: RelaxedAtomicBool
-  value: @IS_NIGHTLY_BUILD@
+  value: true
   mirror: always
   rust: true
 
 # Is support for color-mix with non-SRGB color spaces on content enabled?
 - name: layout.css.color-mix.color-spaces.enabled
   type: RelaxedAtomicBool
-  value: @IS_NIGHTLY_BUILD@
+  value: true
   mirror: always
   rust: true
 
diff --git a/testing/web-platform/meta/css/css-color/parsing/color-invalid-color-mix-function.html.ini b/testing/web-platform/meta/css/css-color/parsing/color-invalid-color-mix-function.html.ini
deleted file mode 100644
index dec1b684dbdf..000000000000
--- a/testing/web-platform/meta/css/css-color/parsing/color-invalid-color-mix-function.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[color-invalid-color-mix-function.html]
-  expected:
-    if (os == "android") and fission: [OK, TIMEOUT]