Examine source code of SteemClicker

{
  "manifest_version": 2,
  "name": "SteemClicker",
  "version": "1.1resigned1",
  "description": "Automates tedious upvoting on user Steemit feed.",
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://steemit.com/*"
      ],
      "js": [
        "steemclicker.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{22958bcd-c437-4508-a4d5-349e454daf2f}"
    }
  }
}