Examine source code of Hexospark

{
  "name": "Hexospark",
  "description": "Hexospark is the all-in-one email and CRM platform designed to spark conversations",
  "version": "2.0.0",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "index.html"
  },
  "icons": {
    "16": "./icon16.png",
    "48": "./icon48.png",
    "128": "./icon128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://hexospark.com/*",
        "https://dash.hexospark.com/*",
        "https://dashhexospark.hexact.io/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{49a67e92-0ba7-445b-9400-87ad819c01d5}"
    }
  }
}