Examine source code of Glagolizator

{
  "manifest_version": 2,
  "name": "Glagolizator",
  "description": "Pretvrataje/zamjena latinicu va glagolicu",
  "author": "Slavic Movement",
  "version": "1.0",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-off-16.png",
      "32": "icons/icon-off-32.png",
      "48": "icons/icon-off-48.png",
      "128": "icons/icon-off-128.png"
    },
    "default_title": "Ћирилизуј"
  },
  "icons": {
    "16": "icons/icon-on-16.png",
    "32": "icons/icon-on-32.png",
    "48": "icons/icon-on-48.png",
    "128": "icons/icon-on-128.png"
  },
  "permissions": [
    "<all_urls>",
    "storage",
    "tabs",
    "webRequest",
    "webRequestBlocking"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0837ed00-b6a1-4e9f-9a26-6241a016282f}"
    }
  }
}