Examine source code of OCR Text Extractor

{
  "manifest_version": 2,
  "name": "OCR Text Extractor",
  "version": "1.0",
  "description": "Select an area of the page and extract text (including OCR for images).",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_title": "Select Text Region",
    "default_icon": "icon.png"
  },
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "tesseract.min.js",
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{28f95698-f095-4b67-8941-1210757eadbb}"
    }
  }
}