[fix] Fixed display of popup on preempted tabs

extension/src/background/main.ts

@@ -68,6 +68,12 @@ reloadRegistryFromStorage(registry)
 function onObservedTabUpdated(tabId: number): void {
   let observation = resolveObservationsForTab(allObservations, tabId);
   if (hasDetectedData(observation)) {
+    if (observation.preemptable) {
+      chrome.pageAction.setPopup({
+        tabId: tabId,
+        popup: chrome.extension.getURL("popup/index.html")
+      });
+    }
     chrome.pageAction.show(tabId);
   } else {
     chrome.pageAction.hide(tabId);
@@ -187,12 +193,6 @@ function onHeadersReceived(
     // modify header
     let headers = details.responseHeaders;
     setHeader(headers, "Content-Type", "text/plain");
-    // set the popup
-    chrome.pageAction.setPopup({
-      tabId: details.tabId,
-      popup: chrome.extension.getURL("popup/index.html")
-    });
-    chrome.pageAction.show(details.tabId);
     return { responseHeaders: headers };
   }
   // if there are still nothing, try to probe with HTTP content negotiation