--- a/toolkit/components/satchel/.eslintrc.js
+++ b/toolkit/components/satchel/.eslintrc.js
@@ -37,10 +37,11 @@ module.exports = {
     "no-use-before-define": ["error", {
       functions: false,
     }],
     complexity: ["error", {
       max: 20,
     }],
     "dot-location": ["error", "property"],
     "max-len": ["error", 100],
+    "no-fallthrough": "error",
   },
 };

--- a/toolkit/components/satchel/FormHistoryStartup.js
+++ b/toolkit/components/satchel/FormHistoryStartup.js
@@ -30,17 +30,16 @@ FormHistoryStartup.prototype = {
       case "formhistory-expire-now":
         FormHistory.expireOldEntries();
         break;
       case "profile-before-change":
         FormHistory.shutdown();
         break;
       case "profile-after-change":
         this.init();
-      default:
         break;
     }
   },
 
   inited: false,
   pendingQuery: null,
 
   init() {