diff --git a/platform/chromium/vapi-background.js b/platform/chromium/vapi-background.js
index 247d5c3cd..01dbb2b84 100644
--- a/platform/chromium/vapi-background.js
+++ b/platform/chromium/vapi-background.js
@@ -1157,11 +1157,10 @@ vAPI.Net = class {
         browser.webRequest.onBeforeRequest.addListener(
             details => {
                 this.normalizeDetails(details);
-                if ( this.suspendDepth === 0 ) {
+                if ( this.suspendDepth === 0 || details.tabId < 0 ) {
                     if ( this.suspendableListener === undefined ) { return; }
                     return this.suspendableListener(details);
                 }
-                if ( details.tabId < 0 ) { return; }
                 return this.suspendOneRequest(details);
             },
             this.denormalizeFilters({ urls: [ 'http://*/*', 'https://*/*' ] }),
diff --git a/platform/firefox/vapi-webrequest.js b/platform/firefox/vapi-webrequest.js
index 9bc4def66..b3c379a3e 100644
--- a/platform/firefox/vapi-webrequest.js
+++ b/platform/firefox/vapi-webrequest.js
@@ -115,7 +115,7 @@
                 resolve: undefined,
                 promise: undefined
             };
-            pending.promise = new Promise(function(resolve) {
+            pending.promise = new Promise(resolve => {
                 pending.resolve = resolve;
             });
             this.pendingRequests.push(pending);