diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
index 380ea99..aed693a 100644
--- a/.gitea/workflows/build.yaml
+++ b/.gitea/workflows/build.yaml
@@ -23,8 +23,10 @@ jobs:
       id: version
     - name: Install dependencies
       run: bun install
-    - name: Test project
-      run: bun test --define __VERSION__='${{ steps.version.outputs.version }}' --define __EXTENSION_NAME='"tf2wikipricing"'
+    - name: Test UserScript version
+      run: bun test --define __VERSION__='${{ steps.version.outputs.version }}' --define __EXTENSION_NAME='"tf2wikipricing"' --define __ENV_USERSCRIPT=1 --define __ENV_WEBEXTENSION=0
+    - name: Test WebExtension version
+      run: bun test --define __VERSION__='${{ steps.version.outputs.version }}' --define __EXTENSION_NAME='"tf2wikipricing"' --define __ENV_USERSCRIPT=0 --define __ENV_WEBEXTENSION=1
     - name: Build project
       run: bun run build
     - name: Archive production artifacts
diff --git a/.gitea/workflows/release.yaml b/.gitea/workflows/release.yaml
index a6cfd0b..adff067 100644
--- a/.gitea/workflows/release.yaml
+++ b/.gitea/workflows/release.yaml
@@ -19,8 +19,10 @@ jobs:
       id: version
     - name: Install dependencies
       run: bun install
-    - name: Test project
-      run: bun test --define __VERSION__='${{ steps.version.outputs.version }}' --define __EXTENSION_NAME='"tf2wikipricing"'
+    - name: Test UserScript version
+      run: bun test --define __VERSION__='${{ steps.version.outputs.version }}' --define __EXTENSION_NAME='"tf2wikipricing"' --define __ENV_USERSCRIPT=1 --define __ENV_WEBEXTENSION=0
+    - name: Test WebExtension version
+      run: bun test --define __VERSION__='${{ steps.version.outputs.version }}' --define __EXTENSION_NAME='"tf2wikipricing"' --define __ENV_USERSCRIPT=0 --define __ENV_WEBEXTENSION=1
     - name: Build project
       run: bun run build --mode production
     - name: Archive production artifacts
diff --git a/bun.lockb b/bun.lockb
index a4c615f..c4e438a 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/happydom.ts b/happydom.ts
index 9cae201..a51cee6 100644
--- a/happydom.ts
+++ b/happydom.ts
@@ -1,3 +1,4 @@
 import { GlobalRegistrator } from "@happy-dom/global-registrator";
 
-GlobalRegistrator.register();
\ No newline at end of file
+GlobalRegistrator.register();
+Object.assign(global, require('jest-chrome'))
\ No newline at end of file
diff --git a/package.json b/package.json
index 9e9db52..e83fc63 100644
--- a/package.json
+++ b/package.json
@@ -46,6 +46,7 @@
     "css-loader": "^7.1.2",
     "css-to-string-loader": "^0.1.3",
     "extract-loader": "^5.1.0",
+    "jest-chrome": "^0.8.0",
     "jsonc-loader": "^0.1.1",
     "mini-css-extract-plugin": "^2.9.2",
     "postcss-loader": "^8.1.1",