--- a/browser/modules/ContentCrashHandlers.jsm
+++ b/browser/modules/ContentCrashHandlers.jsm
@@ -655,16 +655,20 @@ this.UnsubmittedCrashHandler = {
    * bar to prompt the user to submit them.
    *
    * @returns Promise
    *          Resolves with the <xul:notification> after it tries to
    *          show a notification on the most recent browser window.
    *          If a notification cannot be shown, will resolve with null.
    */
   async checkForUnsubmittedCrashReports() {
+    if (!this.enabled || this.suppressed) {
+      return null;
+    }
+
     let dateLimit = new Date();
     dateLimit.setDate(dateLimit.getDate() - PENDING_CRASH_REPORT_DAYS);
 
     let reportIDs = [];
     try {
       reportIDs = await CrashSubmit.pendingIDs(dateLimit);
     } catch (e) {
       Cu.reportError(e);

--- a/browser/modules/test/browser/browser_UnsubmittedCrashHandler.js
+++ b/browser/modules/test/browser/browser_UnsubmittedCrashHandler.js
@@ -201,16 +201,35 @@ add_task(async function setup() {
   // nsBrowserGlue starts up UnsubmittedCrashHandler automatically
   // so at this point, it is initialized. It's possible that it
   // was initialized, but is preffed off, so it's inert, so we
   // shut it down, make sure it's preffed on, and then restart it.
   // Note that making the component initialize even when it's
   // disabled is an intentional choice, as this allows for easier
   // simulation of startup and shutdown.
   UnsubmittedCrashHandler.uninit();
+
+  // While we're here, let's test that we don't show the notification
+  // if we're disabled and something happens to check for unsubmitted
+  // crash reports.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.crashReports.unsubmittedCheck.enabled", false],
+    ],
+  });
+
+  await createPendingCrashReports(1);
+
+  notification =
+    await UnsubmittedCrashHandler.checkForUnsubmittedCrashReports();
+  Assert.ok(!notification, "There should not be a notification");
+
+  clearPendingCrashReports();
+  await SpecialPowers.popPrefEnv();
+
   await SpecialPowers.pushPrefEnv({
     set: [
       ["browser.crashReports.unsubmittedCheck.enabled", true],
     ],
   });
   UnsubmittedCrashHandler.init();
 
   registerCleanupFunction(function() {