Examine source code of Azbuka Extension

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Azbuka",
  "short_name": "Azbuka",
  "version": "2.0.60",
  "manifest_version": 2,
  "description": "Convert Cyrillic to Latin, or Latin to Cyrillic. Now with medžuslovjansky support.",
  "permissions": [
    "contextMenus"
  ],
  "options_page": "options.html",
  "browser_action": {
    "default_icon": "icon/19.png",
    "default_popup": "popup.html",
    "default_title": "Azbuka"
  },
  "icons": {
    "16": "icon/16.png",
    "19": "icon/19.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file://*/*"
      ],
      "js": [
        "content.js",
        "selection.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js",
      "utils.js",
      "dictionary_belarusian.js",
      "dictionary_belarusian2.js",
      "dictionary_bulgarian.js",
      "dictionary_bulgarian2.js",
      "dictionary_montenegrin.js",
      "dictionary_montenegrin2.js",
      "dictionary_macedonian.js",
      "dictionary_macedonian2.js",
      "dictionary_russian.js",
      "dictionary_russian2.js",
      "dictionary_serbian.js",
      "dictionary_serbian2.js",
      "dictionary_ukrainian.js",
      "dictionary_ukrainian2.js",
      "dictionary_medzuslovjansky2.js",
      "dictionary_croatian.js",
      "dictionary_czech.js",
      "dictionary_polish.js",
      "dictionary_slovak.js",
      "dictionary_slovenian.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4f54777d-a937-4492-aa74-5553de4fb1d2}"
    }
  }
}