`firefox-profile` cannot delete `profileDir`

Describe the bug

[firefox-profile] cannot delete profileDir on exit ***\AppData\Local\Temp\firefox-profileln8DEw/ Error: EPERM, Permission denied: \\?\***\AppData\Local\Temp\firefox-profileln8DEw '\\?\***\AppData\Local\Temp\firefox-profileln8DEw'
at Object.rmSync (node:fs:1205:18)
at FirefoxProfile ._ cleanOnExit (***\wxt\node_modules\.pnpm\firefox-profile@4.7.0\node_modules\firefox-profile\lib\firefox_profile. js:289:12)
at process. FirefoxProfile. onExit (***\wxt\node_modules\.pnpm\firefox-profile@4.7.0\node_modules\firefox-profile\lib\firefox_profile. js:172:12)
at process.emit (node:events:520:22)
at process.emit (node: domain: 489:12)
at process.exit (node:internal/process/per_thread:236:15)
at process. FirefoxProfile. onSigInt (***\wxt\node_modules\.pnpm\firefox-profile@4.7.0\node_modules\firefox-profile\lib\firefox_profile.js:177:13)
at process.emit (node: events: 508:20)
at process.emit (node: domain: 489:12)
at Signal. callbackTrampoline (node: internal/async_hooks:131:14) {
  errno: 1,
    code: 'EPERM'
  path: '\\\\?\C:\\Users\\***\\AppData\\Local\\Temp\\firefox-profileln8DEw',
    syscall: 'rm'

On *** - was a absolute path from my PC
It's happening on close wxt -b firefox

Reproduction

1. Clone this repo
2. Run wxt -b firefox on packages/wxt-demo

Steps to reproduce

No response

System Info

System:
    OS: Windows 11 10.0.26200
    CPU: (12) x64 AMD Ryzen 5 3600 6-Core Processor              
    Memory: 16.52 GB / 31.91 GB
  Binaries:
    Node: 25.6.1 - C:\Program Files\nodejs\node.EXE
    npm: 11.9.0 - C:\Program Files\nodejs\npm.CMD
    pnpm: 10.29.2 - C:\Users\***\AppData\Local\pnpm\pnpm.CMD
    bun: 1.3.3 - C:\Users\***\.bun\bin\bun.EXE
  Browsers:
    Chrome: 146.0.7680.178
    Edge: Chromium (140.0.3485.54)
    Firefox: 149.0 - C:\Program Files\Mozilla Firefox\firefox.exe
    Internet Explorer: 11.0.26100.7309
  npmPackages:
    wxt: workspace:* => 0.20.20

Used Package Manager

pnpm

Validations

• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

Reproduce the issue from packages/wxt-demo with wxt -b firefox on Windows 11, then inspect the shutdown path reported in node_modules/firefox-profile/lib/firefox_profile.js, especially cleanup at line 289. Determine how WXT's Firefox launch and exit flow relates to the EPERM failure, and verify that the temporary profile is removed without an error on exit.