diff --git a/librewolf.cfg b/librewolf.cfg
index a68b028..c268e2a 100755
--- a/librewolf.cfg
+++ b/librewolf.cfg
@@ -162,6 +162,8 @@ defaultPref("webgl.disabled", true); // master switch, disable webgl
 // # SECURITY
 // --------------------------------
 
+defaultPref("fission.autostart", true); // enable fission by default
+
 // certificates
 defaultPref("security.cert_pinning.enforcement_level", 2); // enable strict public key pinning
 defaultPref("security.pki.sha1_enforcement_level", 1); // disable sha-1 certificates