diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index d82879a3f6..0902ef55f2 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1503,14 +1503,14 @@ pref("network.http.accept.default", "*/*");
 // Top-level navigation should include all non-ubiquitous mime types in front of */*
 // including image and video/audio types that are handled top-level.
 #ifdef MOZ_JXL
-pref("network.http.accept.navigation", "text/html,application/xhtml+xml,application/xml;q=0.9,image/jxl,image/webp,video/x-matroska,video/webm,*/*;q=0.8");
+pref("network.http.accept.navigation", "text/html,application/xhtml+xml,application/xml;q=0.9,image/jxl,image/webp,image/apng,video/x-matroska,video/webm,*/*;q=0.8");
 #else
 pref("network.http.accept.navigation", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,video/x-matroska,video/webm,*/*;q=0.8");
 #endif
 #ifdef MOZ_JXL
-pref("network.http.accept.image", "image/jxl,image/webp,image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5");
+pref("network.http.accept.image", "image/jxl,image/webp,image/apng,image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5");
 #else
-pref("network.http.accept.image", "image/webp,image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5");
+pref("network.http.accept.image", "image/webp,image/apng,image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5");
 #endif
 pref("network.http.accept.style", "text/css,*/*;q=0.1");