Examine source code of EdScratchCzech

{
  "name": "EdScratchCzech",
  "version": "1.4",
  "description": "Translate EdScratch blocks into Czech",
  "manifest_version": 2,
  "icons": {
    "128": "icon.png"
  },
  "permissions": [
    "*://*.edscratchapp.com/*",
    "webRequest",
    "webRequestBlocking",
    "declarativeContent",
    "storage"
  ],
  "background": {
    "scripts": [
      "translate_blocks.js"
    ]
  },
  "web_accessible_resources": [
    "blocks_compressed_vertical_czech.js",
    "blockly_compressed_vertical_czech.js",
    "errorMessages_czech.js"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.edscratchapp.com/*"
      ],
      "js": [
        "translate_dom.js"
      ]
    }
  ],
  "options_ui": {
    "chrome_style": true,
    "page": "settings.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{16e5eef2-6d5a-43f4-b21b-60791c63e878}"
    }
  }
}