Examine source code of about:about Button

{
  "applications": {
    "gecko": {
      "id": "about-button@exe-boss",
      "strict_min_version": "52.0"
    }
  },
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "0.1.21resigned1",
  "author": "ExE Boss",
  "description": "__MSG_description__",
  "default_locale": "en",
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/16/cog.png",
    "24": "icons/24/cog.png",
    "32": "icons/32/cog.png",
    "48": "icons/48/cog.png",
    "64": "icons/64/cog.png",
    "72": "icons/72/cog.png",
    "96": "icons/96/cog.png",
    "128": "icons/128/cog.png",
    "256": "icons/256/cog.png"
  },
  "background": {
    "scripts": [
      "shared.js",
      "background.js"
    ]
  },
  "options_ui": {
    "browser_style": true,
    "page": "options/options.xhtml"
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "__MSG_browserAction__",
    "default_popup": "popup/popup.xhtml",
    "default_icon": {
      "16": "icons/16/cog.png",
      "24": "icons/24/cog.png",
      "32": "icons/32/cog.png",
      "48": "icons/48/cog.png",
      "64": "icons/64/cog.png",
      "72": "icons/72/cog.png",
      "96": "icons/96/cog.png",
      "128": "icons/128/cog.png",
      "256": "icons/256/cog.png"
    }
  }
}