Support Manifest v3

[piroor]

Mozilla announced that the background page is deprecated and we need to migrate to service workers on manifest v3. https://blog.mozilla.org/addons/2021/05/27/manifest-v3-update/

There are some information to migrate background page to service workers:

• [request] Manifest V3 serviceWorker example · Issue #528 · GoogleChrome/chrome-extensions-samples
• javascript - Chrome extension - migrate from manifest v2 to v3 - Stack Overflow
• Manage events with service workers - Chrome Developers