[fenix] For https://github.com/mozilla-mobile/fenix/issues/25435: Handle ERROR_BAD_HSTS_CERT error.

app/src/androidTest/java/org/mozilla/fenix/AppRequestInterceptor.kt

@@ -188,6 +188,7 @@ class AppRequestInterceptor(private val context: Context) : RequestInterceptor {
         ErrorType.ERROR_UNKNOWN_PROXY_HOST,
         ErrorType.ERROR_NO_INTERNET,
         ErrorType.ERROR_HTTPS_ONLY,
+        ErrorType.ERROR_BAD_HSTS_CERT,
         ErrorType.ERROR_UNKNOWN_PROTOCOL -> RiskLevel.Low
 
         ErrorType.ERROR_SECURITY_BAD_CERT,

app/src/main/assets/lowMediumErrorPages.js

@@ -12,6 +12,7 @@ function parseQuery(queryString) {
     const query = Object.fromEntries(new URLSearchParams(queryString).entries());
     injectValues(query);
     updateShowSSL(query);
+    updateShowHSTS(query);
 };
 
 /**
@@ -71,6 +72,24 @@ function updateShowSSL(queryMap) {
     }
 };
 
+/**
+ * Used to show or hide the "advanced" button based for the HSTS error page
+ */
+function updateShowHSTS(queryMap) {
+    /** @type {'true' | 'false'} */
+    const showHSTS = queryMap.showHSTS;
+    if (typeof document.addCertException === "undefined") {
+        document.getElementById('advancedButton').style.display='none';
+    } else {
+        if (showHSTS === 'true') {
+            document.getElementById('advancedButton').style.display='block';
+            document.getElementById('advancedPanelAcceptButton').style.display='none';
+        } else {
+            document.getElementById('advancedButton').style.display='none';
+        }
+    }
+}
+
 /**
  * Used to display information about the SSL certificate in `error_pages.html`
  */

app/src/main/java/org/mozilla/fenix/AppRequestInterceptor.kt

@@ -151,6 +151,7 @@ class AppRequestInterceptor(
         ErrorType.ERROR_UNKNOWN_PROXY_HOST,
         ErrorType.ERROR_NO_INTERNET,
         ErrorType.ERROR_HTTPS_ONLY,
+        ErrorType.ERROR_BAD_HSTS_CERT,
         ErrorType.ERROR_UNKNOWN_PROTOCOL -> RiskLevel.Low
 
         ErrorType.ERROR_SECURITY_BAD_CERT,