Examine source code of feedbin-blocker

{
  "manifest_version": 2,
  "name": "feedbin-blocker",
  "description": "Block access to Feedbin unless there is more than a set amount of unread entries.",
  "version": "1.0",
  "icons": {
    "48": "icons/block.svg",
    "96": "icons/block.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "56.0a1"
    }
  },
  "background": {
    "scripts": [
      "background/request-handler.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "notifications",
    "*://feedbin.com/*",
    "*://www.feedbin.com/*",
    "https://api.feedbin.com/*"
  ]
}