Examine source code of TechPowerUp_rev2

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "TechPowerUp_rev2",
  "manifest_version": 2,
  "description": "Visit <a href=\"https://outgoing.prod.mozaws.net/v1/c7da8693631e767b0eb5856e23b34c952935cd50a887082733e33f307cf2fd43/http%3A//techpowerup.com\" rel=\"nofollow\">techpowerup.com</a>"
}