diff -up thunderbird-78.7.0/comm/mail/extensions/openpgp/content/modules/RNPLib.jsm.seq-pgp thunderbird-78.7.0/comm/mail/extensions/openpgp/content/modules/RNPLib.jsm
--- thunderbird-78.7.0/comm/mail/extensions/openpgp/content/modules/RNPLib.jsm.seq-pgp	2021-02-05 10:53:04.159797183 +0100
+++ thunderbird-78.7.0/comm/mail/extensions/openpgp/content/modules/RNPLib.jsm	2021-02-05 11:12:39.837691933 +0100
@@ -56,6 +56,20 @@ function tryLoadRNP(name, suffix) {
 }
 
 function loadExternalRNPLib() {
+  var useSequoia = Services.prefs.getBoolPref("mail.openpgp.enable-sequoia", false);
+  if (useSequoia) {
+    if (!librnp) {
+      // Try loading librnp.so, librnp.dylib, or rnp.dll first
+      console.log("Loading libsequoia_octopus_librnp.so instead of librnp.so...");
+      tryLoadRNP("sequoia_octopus_librnp", "");
+    }
+    if (!librnp) {
+      console.error("Unable to load libsequoia_octopus_librnp.so, fallback to librnp.so.");
+    }
+  } else {
+      console.log("Loading librnp instead of libsequoia_octopus_librnp.so. Set mail.openpgp.enable-sequoia to true if you want to use it  instead of botan.");
+  }
+
   if (!librnp) {
     // Try loading librnp.so, librnp.dylib, or rnp.dll first
     tryLoadRNP("rnp", "");