diff --git a/extension/package-lock.json b/extension/package-lock.json
index eccb8ad..a71f0f6 100644
--- a/extension/package-lock.json
+++ b/extension/package-lock.json
@@ -19,6 +19,7 @@
         "@trivago/prettier-plugin-sort-imports": "^6.0.2",
         "@types/firefox": "^0.0.34",
         "@types/firefox-webext-browser": "^143.0.0",
+        "@types/node": "^26.1.2",
         "@vitest/browser": "^4.1.8",
         "@vitest/coverage-v8": "^4.1.8",
         "dpdm": "^4.2.0",
@@ -1505,6 +1506,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/node": {
+      "version": "26.1.2",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.1.2.tgz",
+      "integrity": "sha512-Vu4a5UFA9rIIFJ7rB/Vaafh9lrCQszopTCx6KjFboXTGQbPNasehVR5TEiithSDGyd1DEiUByggTZsg8jukeIg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~8.3.0"
+      }
+    },
     "node_modules/@typescript-eslint/eslint-plugin": {
       "version": "8.60.1",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.60.1.tgz",
@@ -3853,6 +3864,13 @@
         "typescript": ">=4.8.4 <6.1.0"
       }
     },
+    "node_modules/undici-types": {
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
+      "integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/universalify": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.1.tgz",
diff --git a/extension/package.json b/extension/package.json
index acbaa86..03158aa 100644
--- a/extension/package.json
+++ b/extension/package.json
@@ -21,6 +21,7 @@
     "@trivago/prettier-plugin-sort-imports": "^6.0.2",
     "@types/firefox": "^0.0.34",
     "@types/firefox-webext-browser": "^143.0.0",
+    "@types/node": "^26.1.2",
     "@vitest/browser": "^4.1.8",
     "@vitest/coverage-v8": "^4.1.8",
     "dpdm": "^4.2.0",
diff --git a/extension/tsconfig.json b/extension/tsconfig.json
index 924d909..387cac0 100644
--- a/extension/tsconfig.json
+++ b/extension/tsconfig.json
@@ -7,7 +7,7 @@
     "strict": true,
     "esModuleInterop": true,
     "skipLibCheck": true,
-    "types": ["firefox-webext-browser", "vite/client"],
+    "types": ["firefox-webext-browser", "vite/client", "node"],
     "resolveJsonModule": true,
     "outDir": "./dist",
     "noEmit": true
diff --git a/extension/vite.config.ts b/extension/vite.config.ts
index 21f267a..7a03261 100644
--- a/extension/vite.config.ts
+++ b/extension/vite.config.ts
@@ -1,6 +1,6 @@
 import path from "path";
-import { defineConfig } from "vite";
 import { viteSingleFile } from "vite-plugin-singlefile";
+import { defineConfig } from "vitest/config";
 
 const isTesting = process.env.TESTING === "true";