[TabGuard] Better request lifecycle management.

src/bg/RequestGuard.js

@@ -655,6 +655,7 @@ var RequestGuard = (() => {
       let {requestId, url, tabId, frameId, type} = request;
       if (type === "main_frame") {
         TabStatus.initTab(tabId);
+        TabGuard.postCheck(request);
       }
       let scriptBlocked = request.responseHeaders.some(
         h => csp.isMine(h) && csp.blocks(h.value, "script")
@@ -687,9 +688,11 @@ var RequestGuard = (() => {
           }
         }
       }
+      TabGuard.postCheck(request);
     },
     onErrorOccurred(request) {
       pendingRequests.delete(request.requestId);
+      TabGuard.postCheck(request);
     }
   };
   function fakeRequestFromCSP(report, request) {

src/bg/TabGuard.js

@@ -44,6 +44,8 @@ var TabGuard = (() => {
     return flat;
   }
 
+  let cutRequestIds = new Set();
+
   return {
     forget,
     check(request) {
@@ -62,9 +64,12 @@ var TabGuard = (() => {
       if (mainFrame) {
         let headers = flattenHeaders(requestHeaders);
         if (headers["sec-fetch-user"] === "?1" && /^(?:same-(?:site|origin)|none)$/i.test(headers["sec-fetch-site"])) {
-          debug("[TabGuard] User-typed, bookmark, reload or user-activated same-site navigation: cutting tab ties.", request);
+          debug("[TabGuard] User-typed, bookmark, reload or user-activated same-site navigation: scheduling tab ties cut.", tabId, request);
-          TabTies.cut(tabId);
+          cutRequestIds.add(tabId);
           return;
+        } else {
+          debug("[TabGuard] Automatic or cross-site navigation, keeping tab ties.", tabId, request);
+          cutRequestIds.delete(tabId);
         }
       }
 
@@ -122,6 +127,13 @@ var TabGuard = (() => {
       }
       let mustFilter = mainFrame || quietDomains && [...otherDomains].some(d => quietDomains.has(d))
       return mustFilter ? filterAuth() : null;
-    }
+    },
+    postCheck(request) {
+      let {requestId, tabId} = request;
+      if (cutRequestIds.has(requestId)) {
+        cutRequestIds.remove(requestId);
+        TabTies.cut(tabId);
+      }
+    },
   }
 })();