Now can inject resources directly into window context

source/common/background/inject.js

+// This code is executed in the background context
+// source: https://stackoverflow.com/questions/9862182/on-page-load-event-in-chrome-extensions
+//         https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/tabs/executeScript
+
+// Listen for the navigation event
+chrome.webNavigation.onCompleted.addListener (function(details) {
+	// Execute the context script in its own context with "clean DOM"
+	chrome.tabs.executeScript(details.tabId, {
+		file: "/content_scripts/inject.js"
+	});
+});
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source/common/content_scripts/inject.js

+// This code is executed in a separate context with "clean DOM"
+
+(function() {
+	// Execute the actal payload in the context of the window
+	var s = document.createElement("script");
+	s.src = chrome.extension.getURL("/web_accessible_resources/inject.js");
+	s.onload = function() {
+		this.remove();
+	}
+	(document.head || document.documentElement).appendChild(s);
+})()
\ No newline at end of file

source/common/content_scripts/open-dialog.js

-alert("Hi");
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source/common/manifest.json

@@ -11,7 +11,9 @@
 	},
 	"permissions": [
 		"storage",
-		"cookies"
+		"cookies",
+		"tabs",
+		"webNavigation"
 	],
 	"optional_permissions": [
 		"webRequest",
@@ -24,8 +26,12 @@
 	},
 	"background": {
 		"scripts": [
-				"background/cookiestore.js"
+				"background/cookiestore.js",
+				"background/inject.js"
 			],
-		"persistent": false
-	}
+		"persistent": true
+	},
+	"web_accessible_resources": [
+		"web_accessible_resources/*"
+	]
 }
\ No newline at end of file

source/common/web_accessible_resources/inject.js

+// This code is executed in the context of the window
+
+var veryConvolutedInjection = 4;
+
+console.log("Injection completed, try logging the variable veryConvolutedInjection");
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