address remaining quirks (see https://github.com/uBlockOrigin/uMatrix-issues/issues/62#issuecomment-428594617)

src/js/logger-ui.js

@@ -556,7 +556,7 @@ var pageSelectorChanged = function() {
         );
     }
     document.getElementById('reloadTab').classList.toggle('disabled', tabId <= 0);
-    document.getElementById('popupPanelButton').classList.toggle('disabled', tabId === 0);
+    document.getElementById('popupPanelButton').classList.toggle('disabled', tabId <= 0);
     popupPanel.update();
 };
 
@@ -672,7 +672,7 @@ var popupPanel = (function() {
 
     let start = function() {
         let newTabId = tabIdFromPageSelector();
-        if ( newTabId === 0 ) {
+        if ( newTabId <= 0 ) {
             return stop();
         }
         if ( newTabId === tabId ) { return; }

src/js/messaging.js

@@ -369,12 +369,7 @@ var matrixSnapshotFromTabId = function(details, callback) {
             callback('ENOTFOUND');
             return;
         }
-
+        matrixSnapshotIf(tab.id, details);
-        // Allow examination of behind-the-scene requests
-        var tabId = tab.url.lastIndexOf(vAPI.getURL('dashboard.html'), 0) !== 0 ?
-            tab.id :
-            vAPI.noTabId;
-        matrixSnapshotIf(tabId, details);
     };
 
     vAPI.tabs.get(null, onTabReady);

src/js/pagestats.js

@@ -208,6 +208,8 @@ PageStore.prototype = {
     },
 
     recordRequest: function(type, url, block) {
+        if ( this.tabId <= 0 ) { return; }
+
         if ( block ) {
             this.perLoadBlockedRequestCount++;
         } else {