Examine source code of Programmer's Calculator

{
  "manifest_version": 2,
  "name": "Programmer's Calculator",
  "author": "Andrey Shemetov",
  "description": "__MSG_addonDesc__",
  "version": "1.3",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "{21d4695b-be86-4244-80fb-75a91ae33547}"
    }
  },
  "icons": {
    "16": "icons/calc_16.png",
    "24": "icons/calc_24.png",
    "32": "icons/calc_32.png",
    "48": "icons/calc_48.png",
    "64": "icons/calc_64.png",
    "128": "icons/calc_128.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/calc_16.png",
      "24": "icons/calc_24.png",
      "32": "icons/calc_32.png",
      "48": "icons/calc_48.png",
      "64": "icons/calc_64.png",
      "128": "icons/calc_128.png"
    },
    "default_title": "Programmer's Calculator",
    "default_popup": "popup/popup.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+6"
      },
      "description": "Open Programmer''s Calc"
    }
  },
  "options_ui": {
    "browser_style": true,
    "page": "prefs/prefs.html"
  },
  "background": {
    "scripts": [
      "common.js",
      "background.js"
    ]
  },
  "permissions": [
    "alarms",
    "clipboardWrite",
    "contextMenus",
    "notifications",
    "storage"
  ]
}