diff --git a/.eslintignore b/.eslintignore
index 2cd9862cd76..7d90ff9e87c 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -39,4 +39,4 @@ yarn-error.log*
 
 # ESLint ignores.
 assets/
-vendor/
+third_party/
diff --git a/.eslintrc.js b/.eslintrc.js
index 42bb469db85..6759911c3ac 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -103,7 +103,7 @@ module.exports = {
           {
             name: 'mitt',
             message:
-              'Import Mitt from the vendored location: vendor/mitt/index.js',
+              'Import `mitt` from the vendored location: third_party/mitt/index.js',
           },
         ],
       },
diff --git a/docs/contributing.md b/docs/contributing.md
index c97d4021b4b..42103f2410e 100644
--- a/docs/contributing.md
+++ b/docs/contributing.md
@@ -101,7 +101,7 @@ The following is a description of the primary folders in Puppeteer:
 - `utils/mochaRunner` - contains the source code for our test runner.
 - `compat` - contains code separated by module import type. See [`compat/README.md`](https://github.com/puppeteer/puppeteer/blob/main/compat/README.md) for details.
 - `test-d` contains type tests using [`tsd`](https://github.com/SamVerschueren/tsd).
-- `vendor` contains all dependencies that we vendor into the final build. See the [`vendor/README.md`](https://github.com/puppeteer/puppeteer/blob/main/vendor/README.md) for details.
+- `third_party` contains all dependencies that we vendor into the final build. See the [`third_party/README.md`](https://github.com/puppeteer/puppeteer/blob/main/third_party/README.md) for details.
 
 ### Shipping CJS and ESM bundles
 
@@ -113,10 +113,10 @@ We compile into the `lib` directory which is what we publish on the npm reposito
 lib
 - cjs
   - puppeteer <== the output of compiling `src/tsconfig.cjs.json`
-  - vendor <== the output of compiling `vendor/tsconfig.cjs.json`
+  - third_party <== the output of compiling `third_party/tsconfig.cjs.json`
 - esm
   - puppeteer <== the output of compiling `src/tsconfig.esm.json`
-  - vendor <== the output of compiling `vendor/tsconfig.esm.json`
+  - third_party <== the output of compiling `third_party/tsconfig.json`
 ```
 
 ### `tsconfig.json` for the tests
@@ -184,7 +184,7 @@ A barrier for introducing new installation dependencies is especially high:
 
 - **Do not add** installation dependency unless it's critical to project success.
 
-There are additional considerations for dependencies that are environment agonistic. See the [`vendor/README.md`](https://github.com/puppeteer/puppeteer/blob/main/vendor/README.md) for details.
+There are additional considerations for dependencies that are environment agonistic. See the [`third_party/README.md`](https://github.com/puppeteer/puppeteer/blob/main/third_party/README.md) for details.
 
 ## Running & Writing Tests
 
diff --git a/package.json b/package.json
index 205bf373f40..ec238d31f34 100644
--- a/package.json
+++ b/package.json
@@ -57,11 +57,11 @@
     "check:protocol-revision": "tsx scripts/ensure-correct-devtools-protocol-package",
     "check:pinned-deps": "tsx scripts/ensure-pinned-deps",
     "build": "npm run build:prod",
-    "build:dev": "run-s generate:sources build:tsc:dev && run-p bundle:vendor generate:artifacts",
-    "build:prod": "run-s generate:sources build:tsc:prod && run-p bundle:vendor generate:artifacts",
+    "build:dev": "run-s generate:sources build:tsc:dev && run-p bundle:third_party generate:artifacts",
+    "build:prod": "run-s generate:sources build:tsc:prod && run-p bundle:third_party generate:artifacts",
     "build:tsc:dev": "tsc -b test",
     "build:tsc:prod": "tsc -b tsconfig.lib.json",
-    "bundle:vendor": "rollup --config rollup.vendor.config.js"
+    "bundle:third_party": "rollup --config rollup.third_party.config.js"
   },
   "files": [
     "lib",
diff --git a/rollup.vendor.config.js b/rollup.third_party.config.js
similarity index 78%
rename from rollup.vendor.config.js
rename to rollup.third_party.config.js
index a87ea405d2b..0ca4ba3e43c 100644
--- a/rollup.vendor.config.js
+++ b/rollup.third_party.config.js
@@ -13,22 +13,23 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import path from 'path';
+import glob from 'glob';
 import dts from 'rollup-plugin-dts';
 import resolve from 'rollup-plugin-node-resolve';
-import glob from 'glob';
 
 export default ['cjs', 'esm'].flatMap(outputType => {
   const configs = [];
-  const vendorPath = path.resolve(__dirname, `lib/${outputType}/vendor`);
-  for (const jsFile of glob.sync(path.join(vendorPath, '**/*.js'))) {
+  // Note we don't use path.join here. We cannot since `glob` does not support
+  // the backslash path separator.
+  const thirdPartyPath = `lib/${outputType}/third_party`;
+  for (const jsFile of glob.sync(`${thirdPartyPath}/**/*.js`)) {
     configs.push({
       input: jsFile,
       output: {file: jsFile, exports: 'auto', format: outputType},
       plugins: [resolve()],
     });
   }
-  for (const typesFile of glob.sync(path.join(vendorPath, '**/*.d.ts'))) {
+  for (const typesFile of glob.sync(`${thirdPartyPath}/**/*.d.ts`)) {
     configs.push({
       input: typesFile,
       output: {file: typesFile, format: outputType},
diff --git a/src/common/EventEmitter.ts b/src/common/EventEmitter.ts
index d4b1b8f9635..7fa77ab47fa 100644
--- a/src/common/EventEmitter.ts
+++ b/src/common/EventEmitter.ts
@@ -14,7 +14,11 @@
  * limitations under the License.
  */
 
-import mitt, {Emitter, EventType, Handler} from '../../vendor/mitt/index.js';
+import mitt, {
+  Emitter,
+  EventType,
+  Handler,
+} from '../../third_party/mitt/index.js';
 
 /**
  * @public
diff --git a/src/tsconfig.cjs.json b/src/tsconfig.cjs.json
index d5530e7bf98..ba409245e30 100644
--- a/src/tsconfig.cjs.json
+++ b/src/tsconfig.cjs.json
@@ -7,6 +7,6 @@
   },
   "references": [
     {"path": "../compat/cjs/tsconfig.json"},
-    {"path": "../vendor/tsconfig.json"}
+    {"path": "../third_party/tsconfig.json"}
   ]
 }
diff --git a/src/tsconfig.esm.json b/src/tsconfig.esm.json
index 392770c9bf3..4478592376b 100644
--- a/src/tsconfig.esm.json
+++ b/src/tsconfig.esm.json
@@ -7,6 +7,6 @@
   },
   "references": [
     {"path": "../compat/esm/tsconfig.json"},
-    {"path": "../vendor/tsconfig.cjs.json"}
+    {"path": "../third_party/tsconfig.cjs.json"}
   ]
 }
diff --git a/vendor/README.md b/third_party/README.md
similarity index 98%
rename from vendor/README.md
rename to third_party/README.md
index 29e84e6a5cd..38c1844346f 100644
--- a/vendor/README.md
+++ b/third_party/README.md
@@ -1,4 +1,4 @@
-# `vendor`
+# `third_party`
 
 This folder contains code that interacts with third party node modules that will
 be vendored with puppeteer during publishing.
diff --git a/vendor/mitt/index.ts b/third_party/mitt/index.ts
similarity index 100%
rename from vendor/mitt/index.ts
rename to third_party/mitt/index.ts
diff --git a/vendor/tsconfig.cjs.json b/third_party/tsconfig.cjs.json
similarity index 78%
rename from vendor/tsconfig.cjs.json
rename to third_party/tsconfig.cjs.json
index 9cd8c8abb18..9da8dfb79e9 100644
--- a/vendor/tsconfig.cjs.json
+++ b/third_party/tsconfig.cjs.json
@@ -3,7 +3,7 @@
   "compilerOptions": {
     "composite": true,
     "declarationMap": false,
-    "outDir": "../lib/cjs/vendor",
+    "outDir": "../lib/cjs/third_party",
     "sourceMap": false
   }
 }
diff --git a/vendor/tsconfig.json b/third_party/tsconfig.json
similarity index 78%
rename from vendor/tsconfig.json
rename to third_party/tsconfig.json
index f1b2c780f12..fac27476032 100644
--- a/vendor/tsconfig.json
+++ b/third_party/tsconfig.json
@@ -3,7 +3,7 @@
   "compilerOptions": {
     "composite": true,
     "declarationMap": false,
-    "outDir": "../lib/esm/vendor",
+    "outDir": "../lib/esm/third_party",
     "sourceMap": false
   }
 }