Examine source code of Inline Git Blame

{
  "manifest_version": 2,
  "name": "Inline Git Blame",
  "version": "1.3",
  "description": "Show real Git blame info inline on GitHub, GitLab, and Bitbucket with optional API mode and hover details.",
  "permissions": [
    "activeTab",
    "storage",
    "https://api.github.com/*",
    "https://github.com/*",
    "https://gitlab.com/*",
    "https://bitbucket.org/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*",
        "https://gitlab.com/*",
        "https://bitbucket.org/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Inline Git Blame"
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{135d5420-68ad-48eb-bc26-0b2abdda4c0e}"
    }
  }
}