diff --git a/background.js b/background.js
deleted file mode 100644
index 68de4fa..0000000
--- a/background.js
+++ /dev/null
@@ -1,47 +0,0 @@
-/* eslint-disable no-undef */
-// https://stackoverflow.com/a/45985333
-function getBrowser() {
-	if (typeof chrome !== "undefined") {
-		if (typeof browser !== "undefined") {
-			return "Firefox";
-		} else {
-			return "Chrome";
-		}
-	} else {
-		return "Edge";
-	}
-}
-
-chrome.webRequest.onBeforeRequest.addListener(
-	function (details) {
-		if (getBrowser() == "Chrome") {
-			return { redirectUrl: chrome.runtime.getURL("cadmium-playercore-shim.js") };
-		}
-		
-		/* Work around funky CORS behaviour on Firefox */
-		else if (getBrowser() == "Firefox") {
-			let filter = browser.webRequest.filterResponseData(details.requestId);
-			let encoder = new TextEncoder();
-			filter.onstop = () => {
-				fetch(browser.runtime.getURL("cadmium-playercore-shim.js")).
-					then(response => response.text()).
-					then(text => {
-						filter.write(encoder.encode(text));
-						filter.close();
-					});
-			};
-			return {};
-		}
-		
-		else {
-			console.error("Unsupported web browser.");
-			return {};
-		}
-	}, {
-		urls: [
-			"*://assets.nflxext.com/*/ffe/player/html/*",
-			"*://assets.nflxext.com/player/html/ffe/*"
-		],
-		types: ["script"]
-	}, ["blocking"]
-);
diff --git a/cadmium-playercore-shim.js b/cadmium-playercore-shim.js
index a6e9fcc..2cfef06 100644
--- a/cadmium-playercore-shim.js
+++ b/cadmium-playercore-shim.js
@@ -41,7 +41,7 @@ function do_patch(desc, needle, replacement) {
 the response before the body of this script finishes executing */
 var request = new XMLHttpRequest();
 var cadmium_url = document.getElementById("player-core-js").src;
-request.open("GET", cadmium_url + "?no_filter", false); // synchronous
+request.open("GET", cadmium_url, false); // synchronous
 request.send();
 
 var cadmium_src = request.responseText;
diff --git a/manifest.json b/manifest.json
index 9bf12fa..ff4ef89 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,10 +1,10 @@
 {
-	"manifest_version": 2,
+	"manifest_version": 3,
 	"name": "Netflix International",
 	"description": "Displays all available Netflix audio and subtitle tracks.",
-	"version": "2.0.22",
+	"version": "2.0.23",
 	"author": "shirt",
-	"browser_action": {
+	"action": {
 	  "default_icon": "img/icon128.png",
 	  "default_popup": "pages/options.html"
 	},
@@ -19,7 +19,6 @@
 	},
 	"content_scripts": [{
 	  "matches": [
-		"*://assets.nflxext.com/*",
 		"*://netflix.com/*",
 		"*://www.netflix.com/*"
 	  ],
@@ -28,22 +27,34 @@
 	  "js": ["content_script.js"],
 	  "run_at": "document_start"
 	}],
-	"background": {
-	  "scripts": ["background.js"]
-	},
 	"options_ui": {
 	  "page": "pages/options.html",
 	  "open_in_tab": true
 	},
-	"web_accessible_resources": [
-	  "cadmium-playercore-shim.js",
-	  "netflix_max_bitrate.js",
-	  "netflix.css"
-	],
+	"web_accessible_resources": [{
+		"resources": [
+			"cadmium-playercore-shim.js",
+			"netflix_max_bitrate.js",
+			"netflix.css"
+		],
+		"matches": [
+			"*://assets.nflxext.com/*",
+			"*://netflix.com/*",
+			"*://www.netflix.com/*"
+		]
+	}],
+	"declarative_net_request" : {
+		"rule_resources" : [{
+			"id": "1",
+			"enabled": true,
+			"path": "rules.json"
+		}]
+	},
 	"permissions": [
 	  "storage",
-	  "webRequest",
-	  "webRequestBlocking",
+	  "declarativeNetRequestWithHostAccess"
+	],
+	"host_permissions": [
 	  "*://assets.nflxext.com/*",
 	  "*://netflix.com/*",
 	  "*://www.netflix.com/*"
diff --git a/rules.json b/rules.json
new file mode 100644
index 0000000..a948a65
--- /dev/null
+++ b/rules.json
@@ -0,0 +1,26 @@
+[
+    {
+        "id": 1,
+        "priority": 1,
+        "action": {
+            "type": "redirect",
+            "redirect": { "extensionPath": "/cadmium-playercore-shim.js" }
+        },
+        "condition": {
+            "urlFilter": "*://assets.nflxext.com/*/ffe/player/html/*",
+            "resourceTypes": ["script"]
+        }
+    },
+    {
+        "id": 2,
+        "priority": 1,
+        "action": {
+            "type": "redirect",
+            "redirect": { "extensionPath": "/cadmium-playercore-shim.js" }
+        },
+        "condition": {
+            "urlFilter": "*://assets.nflxext.com/player/html/ffe/*",
+            "resourceTypes": ["script"]
+        }
+    }
+]