Examine source code of ZEIT-IO-AddOn

{
  "name": "ZEIT.IO",
  "version": "1.8.3",
  "manifest_version": 2,
  "description": "ZEIT.IO - Time tracking for experts.",
  "homepage_url": "https://zeit.io",
  "icons": {
    "16": "icons/favicon-16x16.png",
    "48": "icons/logo-48.png",
    "128": "icons/logo-128.png"
  },
  "web_accessible_resources": [
    "icons/android-chrome-192x192.png",
    "icons/android-chrome-512x512.png",
    "icons/apple-touch-icon.png",
    "icons/favicon-16x16.png",
    "icons/favicon-32x32.png",
    "icons/logo-48.png",
    "icons/logo-128.png",
    "icons/logo-512.png",
    "https://*.github.com/*",
    "https://*.gitlab.com/*",
    "https://*.atlassian.net/*",
    "https://*.zendesk.com/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_title": "ZEIT.IO",
    "default_popup": "popup.html"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "storage",
    "notifications",
    "contextMenus",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "js/content.js"
      ]
    },
    {
      "matches": [
        "https://*.github.com/*",
        "https://*.github.com/*/*/issues/*",
        "https://*.gitlab.com/*/*/*/issues/*",
        "https://*.atlassian.net/*/*/*/*/boards/*",
        "https://*.atlassian.net/browse/*",
        "https://*.atlassian.net/jira/servicedesk/projects/*/queues/custom/*",
        "https://*.zendesk.com/*",
        "https://*/*/boards/*",
        "https://*/browse/*",
        "https://trello.com/*",
        "https://trello.com/b/*",
        "https://trello.com/c/*",
        "https://*.youtrack.cloud/issue/*",
        "https://*.youtrack.cloud/issues*",
        "https://app.asana.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/integrations.js"
      ]
    }
  ],
  "commands": {
    "start-stop": {
      "suggested_key": {
        "windows": "Ctrl+Shift+S",
        "mac": "Command+Shift+S",
        "chromeos": "Ctrl+Shift+S",
        "linux": "Ctrl+Shift+S"
      },
      "description": "Start the timer."
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f23c88fa-f4b3-40db-b320-5493539c60cb}"
    }
  }
}