Fixed: Exclude build/*.mjs in .gitignore

.gitignore

@@ -7,3 +7,4 @@ wiki
 addon
 build/*
 !build/*.js
+!build/*.mjs

build/webext.run.mjs

@@ -0,0 +1,28 @@
+import webExt from 'web-ext'
+import fs from 'node:fs'
+import { ADDON_PATH } from './utils.js'
+
+let lastArg = process.argv[process.argv.length - 1]
+if (!lastArg || lastArg.startsWith('-')) lastArg = 'firefox'
+
+const IS_FF = lastArg.includes('irefox')
+const cliOpts = {
+  target: IS_FF ? 'firefox-desktop' : 'chromium',
+  sourceDir: ADDON_PATH,
+  keepProfileChanges: true,
+}
+
+async function main() {
+  if (IS_FF) {
+    cliOpts.firefox = lastArg
+    cliOpts.firefoxProfile = './build/profile-' + lastArg
+    await fs.promises.mkdir(cliOpts.firefoxProfile, { recursive: true })
+  } else {
+    cliOpts.chromiumBinary = lastArg
+    cliOpts.chromiumProfile = './build/profile-' + lastArg
+    await fs.promises.mkdir(cliOpts.chromiumProfile, { recursive: true })
+  }
+
+  webExt.cmd.run(cliOpts, { shouldExitProgram: true })
+}
+main()