--- a/toolkit/mozapps/extensions/content/extensions.js
+++ b/toolkit/mozapps/extensions/content/extensions.js
@@ -3167,17 +3167,17 @@ var gDetailView = {
         // The logic here is kind of clunky but we want to mark complete
         // themes as legacy.  There's no explicit flag for complete
         // themes so explicitly check for new style themes (for which
         // isWebExtension is true) or lightweight themes (which have
         // ids that end with @personas.mozilla.org)
         legacy = !(aAddon.isWebExtension || aAddon.id.endsWith("@personas.mozilla.org"));
       }
 
-      if (legacy && aAddon.signedStatus == AddonManager.SIGNEDSTATE_PRIVILEGED) {
+      if (legacy && aAddon.signedState == AddonManager.SIGNEDSTATE_PRIVILEGED) {
         legacy = false;
       }
 
       // Exceptions that can slip through above: the default theme plus
       // test pilot addons until we get SIGNEDSTATE_PRIVILEGED deployed.
       if (legacy && legacyWarningExceptions.includes(aAddon.id)) {
         legacy = false;
       }