diff --git a/user.js b/user.js
index 0c0e567..4f04d77 100644
--- a/user.js
+++ b/user.js
@@ -259,7 +259,6 @@ user_pref("image.mem.decode_bytes_at_a_time", 131072);
 user_pref("image.mem.shared.unmap.min_expiration_ms", 120000);
 user_pref("media.memory_cache_max_size", 1048576);
 user_pref("media.memory_caches_combined_limit_kb", 2560000);
-user_pref("media.cache_size", 2048000);
 user_pref("media.cache_readahead_limit", 9000);
 user_pref("media.cache_resume_threshold", 6000);