diff --git a/docs/customization.md b/docs/customization.md
index 27994b5..653078f 100644
--- a/docs/customization.md
+++ b/docs/customization.md
@@ -110,6 +110,14 @@ keys:
   ```
 
   For alerts customization, see [full explanation with examples](alerts.md).
+- **`"browserOptions"`**\
+  Options to specify which browser to open, including arguments, as specified
+  [here](https://www.npmjs.com/package/open#app). Examples:
+
+  ```json
+  "browserOptions": { "name": "firefox" }
+  "browserOptions": { "name": "chromium", "arguments": ["--incognito"] }
+  ```
 
 ### Reloading config
 
diff --git a/loader.mjs b/loader.mjs
new file mode 100644
index 0000000..9e43805
--- /dev/null
+++ b/loader.mjs
@@ -0,0 +1,4 @@
+import { register } from 'node:module';
+import { pathToFileURL } from 'node:url';
+
+register('ts-node/esm', pathToFileURL('./'));
diff --git a/package.json b/package.json
index 74d8775..474d95d 100644
--- a/package.json
+++ b/package.json
@@ -3,11 +3,11 @@
   "repository": "https://github.com/jannis-baum/vivify.git",
   "author": "Jannis Baum",
   "scripts": {
-    "dev": "VIV_TIMEOUT=0 VIV_PORT=3000 NODE_ENV=development nodemon --ignore tests/rendering/symlinks --exec node --loader ts-node/esm src/app.ts",
-    "viv": "VIV_PORT=3000 node --loader ts-node/esm src/app.ts",
+    "dev": "VIV_TIMEOUT=0 VIV_PORT=3000 NODE_ENV=development nodemon --ignore tests/rendering/symlinks --exec node --import ./loader.mjs src/app.ts",
+    "viv": "VIV_PORT=3000 node --import ./loader.mjs src/app.ts",
     "lint": "eslint src static",
     "lint-markdown": "markdownlint-cli2 --config .github/.markdownlint-cli2.yaml",
-    "test": "node --loader ts-node/esm --test tests/unit/cli.ts tests/unit/alerts.ts",
+    "test": "node --import ./loader.mjs --test tests/unit/cli.ts tests/unit/alerts.ts",
     "deduplicate": "yarn-deduplicate"
   },
   "type": "module",
diff --git a/src/cli.ts b/src/cli.ts
index 1d19e4b..8276f99 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -2,7 +2,7 @@ import axios from 'axios';
 import { existsSync } from 'fs';
 import open from 'open';
 import { resolve as presolve } from 'path';
-import { address } from './config.js';
+import { address, config } from './config.js';
 import { pathToURL, preferredPath } from './utils/path.js';
 
 // exported for unit test
@@ -20,7 +20,7 @@ export const getPathAndLine = (
 };
 
 export const openFileAt = async (path: string) =>
-    open(`${address}${pathToURL(preferredPath(path))}`);
+    open(`${address}${pathToURL(preferredPath(path))}`, { app: config.browserOptions });
 
 const openTarget = async (target: string) => {
     const { path, line } = getPathAndLine(target);
diff --git a/src/config.ts b/src/config.ts
index a3f14c5..de56439 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -1,5 +1,6 @@
 import fs from 'fs';
 import { globSync } from 'glob';
+import { App } from 'open';
 import { homedir } from 'os';
 import path from 'path';
 
@@ -26,6 +27,7 @@ type Config = {
         titles?: Record<string, string>;
         fallbackIcon?: string;
     };
+    browserOptions?: App | App[];
 };
 
 // fills in values from config file config that are not present