diff --git a/.circleci/config.yml b/.circleci/config.yml
index 92afe9183..f8691f8ff 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -53,6 +53,9 @@ workflows:
       - prep-build-test:
           requires:
             - prep-deps
+      - prep-build-test-mv3:
+          requires:
+            - prep-deps
       - prep-build-test-flask:
           requires:
             - prep-deps
@@ -200,8 +203,8 @@ jobs:
       - persist_to_workspace:
           root: .
           paths:
-          - node_modules
-          - build-artifacts
+            - node_modules
+            - build-artifacts
 
   validate-lavamoat-config:
     executor: node-browsers-medium-plus
@@ -305,6 +308,26 @@ jobs:
             - dist-test-flask
             - builds-test-flask
 
+  prep-build-test-mv3:
+    executor: node-browsers-medium-plus
+    steps:
+      - checkout
+      - attach_workspace:
+          at: .
+      - run:
+          name: Build extension in mv3 for testing
+          command: yarn build:test:mv3
+      - run:
+          name: Move test build to 'dist-test' to avoid conflict with production build
+          command: mv ./dist ./dist-test-mv3
+      - run:
+          name: Move test zips to 'builds-test' to avoid conflict with production build
+          command: mv ./builds ./builds-test-mv3
+      - persist_to_workspace:
+          root: .
+          paths:
+            - dist-test-mv3
+            - builds-test-mv3
 
   prep-build-test:
     executor: node-browsers-medium-plus
@@ -419,7 +442,6 @@ jobs:
                 name: Validate release candidate changelog
                 command: yarn lint:changelog:rc
 
-
   test-deps-audit:
     executor: node-browsers
     steps:
@@ -648,7 +670,7 @@ jobs:
     steps:
       - add_ssh_keys:
           fingerprints:
-            - "3d:49:29:f4:b2:e8:ea:af:d1:32:eb:2a:fc:15:85:d8"
+            - '3d:49:29:f4:b2:e8:ea:af:d1:32:eb:2a:fc:15:85:d8'
       - checkout
       - attach_workspace:
           at: .
@@ -670,7 +692,7 @@ jobs:
       - run:
           name: test:coverage:jest
           command: yarn test:coverage:jest
-      - run: 
+      - run:
           name: Validate coverage thresholds
           command: |
             if ! git diff --exit-code jest.config.js development/jest.config.js; then
diff --git a/development/build/scripts.js b/development/build/scripts.js
index 95833b6ed..4c0a4b02d 100644
--- a/development/build/scripts.js
+++ b/development/build/scripts.js
@@ -370,16 +370,20 @@ const postProcessServiceWorker = (
   mv3BrowserPlatforms,
   fileList,
   applyLavaMoat,
+  testing,
 ) => {
   mv3BrowserPlatforms.forEach((browser) => {
     const appInitFile = `./dist/${browser}/app-init.js`;
     const fileContent = readFileSync('./app/scripts/app-init.js', 'utf8');
-    const fileOutput = fileContent
-      .replace('/** FILE NAMES */', fileList)
-      .replace(
+    let fileOutput = fileContent.replace('/** FILE NAMES */', fileList);
+    if (!testing) {
+      // Lavamoat is always set to true in testing mode
+      // This is to enable capturing initialisation time stats using e2e with lavamoat statsMode enabled
+      fileOutput = fileContent.replace(
         'const applyLavaMoat = true;',
         `const applyLavaMoat = ${applyLavaMoat};`,
       );
+    }
     writeFileSync(appInitFile, fileOutput);
   });
 };
@@ -420,16 +424,32 @@ async function bundleMV3AppInitialiser({
     shouldLintFenceFiles,
   })();
 
-  postProcessServiceWorker(mv3BrowserPlatforms, fileList, applyLavaMoat);
+  postProcessServiceWorker(
+    mv3BrowserPlatforms,
+    fileList,
+    applyLavaMoat,
+    testing,
+  );
 
-  let prevChromeFileContent;
-  watch('./dist/chrome/app-init.js', () => {
-    const chromeFileContent = readFileSync('./dist/chrome/app-init.js', 'utf8');
-    if (chromeFileContent !== prevChromeFileContent) {
-      prevChromeFileContent = chromeFileContent;
-      postProcessServiceWorker(mv3BrowserPlatforms, fileList, applyLavaMoat);
-    }
-  });
+  if (devMode && !testing) {
+    let prevChromeFileContent;
+    watch('./dist/chrome/app-init.js', () => {
+      const chromeFileContent = readFileSync(
+        './dist/chrome/app-init.js',
+        'utf8',
+      );
+      if (chromeFileContent !== prevChromeFileContent) {
+        prevChromeFileContent = chromeFileContent;
+        postProcessServiceWorker(mv3BrowserPlatforms, fileList, applyLavaMoat);
+      }
+    });
+  }
+
+  if (testing) {
+    const content = readFileSync('./dist/chrome/runtime-lavamoat.js', 'utf8');
+    const fileOutput = content.replace('statsMode = false', 'statsMode = true');
+    writeFileSync('./dist/chrome/runtime-lavamoat.js', fileOutput);
+  }
 
   console.log(`Bundle end: service worker app-init.js`);
 }
diff --git a/package.json b/package.json
index cbee47008..0dedb95f3 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "benchmark:firefox": "SELENIUM_BROWSER=firefox node test/e2e/benchmark.js",
     "build:test": "SEGMENT_HOST='https://api.segment.io' SEGMENT_WRITE_KEY='FAKE' yarn build test",
     "build:test:flask": "yarn build test --build-type flask",
+    "build:test:mv3": "ENABLE_MV3=true yarn build test",
     "test": "yarn lint && yarn test:unit && yarn test:unit:jest",
     "dapp": "node development/static-server.js node_modules/@metamask/test-dapp/dist --port 8080",
     "dapp-chain": "GANACHE_ARGS='-b 2' concurrently -k -n ganache,dapp -p '[{time}][{name}]' 'yarn ganache:start' 'sleep 5 && yarn dapp'",