Add testing: puppeteer recommended (https://github.com/puppeteer/puppeteer)

[frizensami]

https://dev.to/scahhht/simple-steps-for-testing-a-chrome-extension-in-puppeteer-2pm3

https://tweak-extension.com/blog/complete-guide-test-chrome-extension-puppeteer/

[yewsiang]

Consider Cypress