Examine source code of Cloudsurf

{
  "description": "Adds a browser extension to seamlessly send links from your desktop browser to the Cloudsurf mobile application with just one click",
  "manifest_version": 2,
  "name": "Cloudsurf",
  "version": "3.8resigned1",
  "homepage_url": "https://prod.cloudsurf.co/",
  "icons": {
    "48": "icons/60x60.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "https://prod.cloudsurf.co/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_icon": "icons/30x30_grey.png",
    "default_title": "Cloudsurf",
    "default_popup": "popup/popup.html"
  },
  "web_accessible_resources": [
    "icons/30x30.png",
    "fonts/muli-bold.woff2",
    "fonts/muli-bold.woff",
    "fonts/muli-semibold.woff2",
    "fonts/muli-semibold.woff",
    "fonts/muli-light.woff2",
    "fonts/muli-light.woff",
    "fonts/muli.woff2",
    "fonts/muli.woff",
    "img/select-arrow.png"
  ],
  "background": {
    "scripts": [
      "popup/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1fb681bc-cd0b-46e6-a739-831132c51cdb}"
    }
  }
}