Support for webextension-polyfill

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Webextension-polyfill is an API that helps us supports inconsistent APIs in extension to a rather generalized one!

Example: chrome.* are specific to chromium only, but according to W3C browser.* should be the preferred way, but chrome still doesn't support that! Although Safari and Firefox has first class support for them!

So, wanted to migrate our chome.* APIs to browser.* APIs. As they provide more clean and efficient APIs to work with, improving cross browser compatibility in general!

For implementation notes, one can find this useful:
https://github.com/mozilla/webextension-polyfill

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Also, check out webext-bridge for better message passing!
https://serversideup.net/open-source/webext-bridge/docs/getting-started/quick-example