Examine source code of Refined Bitbucket server

{
  "name": "Refined Bitbucket server",
  "version": "1.3.0",
  "description": "Browser extension that simplifies and adds useful features to bitbucket server UI",
  "homepage_url": "https://github.com/joancaron/refined-bitbucket-server",
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "{e05cddcf-81b2-4f87-899c-5d87fdf17e14}",
      "strict_min_version": "61.0"
    }
  },
  "permissions": [
    "storage",
    "clipboardWrite",
    "contextMenus",
    "activeTab",
    "*://*/*"
  ],
  "browser_action": {
    "default_icon": "icon.png"
  },
  "icons": {
    "128": "icon.png"
  },
  "options_ui": {
    "chrome_style": true,
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "*://*/*"
      ],
      "css": [
        "content.css"
      ],
      "js": [
        "browser-polyfill.min.js",
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "content/*"
  ]
}