Firefox processes blocks reinstall Puppeteer

Steps to reproduce

Tell us about your environment:

• Puppeteer version: 5.2.1
• Platform / OS version: Win 10 x64 (build 2004)
• URLs (if applicable):
• Node.js version: 14.4.0

What steps will reproduce the problem?

Please include code that reproduces the issue.

1. Install Puppeteer with FF (81.0a1)
2. Run script https://gist.github.com/inoyakaigor/19ae0eeabf93fbfc04c368ffa17b6efa
3. Then I got an error Evaluation failed: call to Function() blocked by CSP
4. Uninstall puppeteer and install it with Chromium

What is the expected result? Install succefull

What happens instead? Got an error Rolling back puppeteer@5.2.1 failed (this is probably harmless): EBUSY: resource busy or locked, rmdir '_my_project_path_\node_modules\puppeteer\.local-firefox\win64-81.0a1\firefox'

npm ERR! code EPERM
npm ERR! syscall rename
npm ERR! path _my_project_path_\node_modules\puppeteer
npm ERR! dest _my_project_path_\node_modules\.puppeteer.DELETE
npm ERR! errno -4048
npm ERR! Error: EPERM: operation not permitted, rename '_my_project_path_\node_modules\puppeteer' -> '_my_project_path_\node_modules\.puppeteer.DELETE'

It is happens because firefox processes for each run is not shutdown:

[mjzffr]

Thanks for checking. I’ll track a fix for this over in https://bugzilla.mozilla.org/show_bug.cgi?id=1656962

[whimboo]

That’s great to hear. Thanks a lot for checking.