Examine source code of Hide Feed

{
  "description": "Get things done without distractions.",
  "version": "1.5.5",
  "name": "Hide Feed",
  "background": {
    "scripts": [
      "background/bundle.js"
    ]
  },
  "permissions": [
    "storage",
    "idle",
    "unlimitedStorage"
  ],
  "optional_permissions": [
    "<all_urls>",
    "tabs"
  ],
  "manifest_version": 2,
  "icons": {
    "16": "assets/icon-16.png",
    "48": "assets/icon-48.png",
    "128": "assets/icon-128.png"
  },
  "browser_action": {
    "default_icon": "assets/icon-16.png",
    "default_title": "Hide Feed"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_security_policy": "script-src 'self'; object-src 'self'"
}