Examine source code of Koseva

{
  "icons": {
    "48": "48.png",
    "128": "128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "koseva.js"
      ]
    }
  ],
  "name": "Koseva",
  "version": "2.0.2",
  "description": "Paleo-Hebrew browser extension.",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "koseva.bg.js"
    ],
    "persistent": false
  },
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{c0c464ba-c86b-4e30-9eb9-8dce60693277}"
    }
  }
}