Examine source code of links.factorware.com

{
  "manifest_version": 2,
  "author": "factorware.com",
  "name": "links.factorware.com",
  "version": "2.4",
  "description": "Popup window browser extension for links.factorware.com",
  "homepage_url": "https://links.factorware.com",
  "icons": {
    "16": "icons/dark-favicon-16x16.png",
    "30": "icons/dark-favicon-30x30.png",
    "32": "icons/dark-favicon-32x32.png",
    "40": "icons/dark-favicon-40x40.png",
    "48": "icons/dark-favicon-48x48.png",
    "128": "icons/dark-favicon-128x128.png",
    "176": "icons/dark-favicon-176x176.png",
    "218": "icons/dark-favicon-218x218.png",
    "256": "icons/dark-favicon-256x256.png"
  },
  "permissions": [
    "webNavigation",
    "https://links.factorware.com/*",
    "storage",
    "activeTab",
    "tabs",
    "bookmarks"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/dark-favicon-16x16.png",
      "32": "icons/dark-favicon-32x32.png"
    },
    "default_title": "links.factorware.com",
    "default_popup": "popup/main.html",
    "theme_icons": [
      {
        "light": "icons/light-favicon-16x16.png",
        "dark": "icons/dark-favicon-16x16.png",
        "size": 16
      },
      {
        "light": "icons/light-favicon-30x30.png",
        "dark": "icons/dark-favicon-30x30.png",
        "size": 30
      },
      {
        "light": "icons/light-favicon-32x32.png",
        "dark": "icons/dark-favicon-32x32.png",
        "size": 32
      },
      {
        "light": "icons/light-favicon-40x40.png",
        "dark": "icons/dark-favicon-40x40.png",
        "size": 40
      },
      {
        "light": "icons/light-favicon-48x48.png",
        "dark": "icons/dark-favicon-48x48.png",
        "size": 48
      },
      {
        "light": "icons/light-favicon-128x128.png",
        "dark": "icons/dark-favicon-128x128.png",
        "size": 128
      },
      {
        "light": "icons/light-favicon-176x176.png",
        "dark": "icons/dark-favicon-176x176.png",
        "size": 176
      },
      {
        "light": "icons/light-favicon-218x218.png",
        "dark": "icons/dark-favicon-218x218.png",
        "size": 218
      },
      {
        "light": "icons/light-favicon-256x256.png",
        "dark": "icons/dark-favicon-256x256.png",
        "size": 256
      }
    ]
  }
}