Examine source code of Slice New Tab - You Browse. We Pay.

{
  "manifest_version": 2,
  "name": "Slice New Tab (discontinued)",
  "description": "Take back what belongs to you - monetize your browser, get paid for ads, cash in with Slice.",
  "homepage_url": "https://addslice.com",
  "version": "0.0.9",
  "default_locale": "en",
  "icons": {
    "16": "extensionIcon.png",
    "48": "extensionIcon.png",
    "128": "extensionIcon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_action": {
    "default_title": "Click to open the Slice New Tab page."
  },
  "permissions": [
    "storage",
    "topSites"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://sli.ce.it/tab"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://addslice.com/auth"
      ],
      "js": [
        "auth.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{762d0e90-7088-4e70-af31-585274d4f6a1}"
    }
  }
}