Update to Manifest V3

[XjSv]

Since Manifest v2 is being sunset https://developer.chrome.com/docs/extensions/mv3/mv2-sunset/, an update is needed to migrate to v3.
More information can be found here: https://developer.chrome.com/docs/extensions/mv3/intro/

[XjSv]

There is a migration issue which is being discussed here: mozilla/webextension-polyfill#329