diff --git a/package.json b/package.json
index 89cf55dc75..2452f57a3c 100644
--- a/package.json
+++ b/package.json
@@ -10,11 +10,11 @@
   },
   "scripts": {
     "start": "docker compose up -d && grunt",
-    "coverage": "PUPPETEER_ARGS='--no-sandbox' PUPPETEER_EXECUTABLE_PATH=$(which chromium) mochify --transform [ babelify ] --plugin [ mochify-istanbul --exclude '**/+(tests|node_modules|libs)/**/*' --report lcov --dir ./coverage --instrumenter babel-istanbul] --reporter spec ./tests/harness/common './tests/js/web/**/*Test.js'",
+    "coverage": "mochify --transform [ babelify ] --plugin [ mochify-istanbul --exclude '**/+(tests|node_modules|libs)/**/*' --report lcov --dir ./coverage --instrumenter babel-istanbul] --reporter spec ./tests/harness/common './tests/js/web/**/*Test.js'",
     "test": "npm run test:headless",
     "build:tests": "grunt javascript:tests",
     "build:tests:watch": "grunt javascript:tests:watch",
-    "test:headless": "PUPPETEER_ARGS='--no-sandbox' PUPPETEER_EXECUTABLE_PATH=$(which chromium) mochify --reporter spec --transform [ babelify ] ./tests/harness/common './tests/js/web/**/*Test.js'",
+    "test:headless": "mochify --reporter spec --transform [ babelify ] ./tests/harness/common './tests/js/web/**/*Test.js'",
     "test:browser": "npm run build:tests && open ./tests/js/web/index.html",
     "test:browser:watch": "npm run build:tests:watch"
   },
diff --git a/tests/js/web/Notifications/FaviconEditorTest.js b/tests/js/web/Notifications/FaviconEditorTest.js
index ead99ab76f..caac27f6b8 100644
--- a/tests/js/web/Notifications/FaviconEditorTest.js
+++ b/tests/js/web/Notifications/FaviconEditorTest.js
@@ -145,21 +145,7 @@ describe('FaviconEditor', () => {
                 faviconEditor = new FaviconEditor($root[0]);
                 faviconEditor.init();
 
-                // Override serializer to return raw image data, we cannot use the default
-                // canvas.toDataURL(...) here as the png compression is different when
-                // in the browser / headless test environments
-                faviconEditor.setSerializer((canvas, ctx) => {
-                    const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
-                    const debugCvs = document.createElement('canvas');
-                    const debugCtx = debugCvs.getContext('2d');
-
-                    debugCtx.width = canvas.width;
-                    debugCtx.height = canvas.height;
-                    debugCtx.putImageData(imageData, 0, 0);
-                    actual = debugCvs.toDataURL('image/png');
-
-                    return [...imageData.data];
-                });
+                canvas.toDataURL('image/png');
 
                 faviconEditor.addCircleNotification('red', 5)
                     .then((data) => {