Examine source code of $Saver

{
  "manifest_version": 2,
  "name": "$Saver",
  "version": "1.0.3",
  "description": "Web extension to save you money on frequently used sites! Current sites include Giant, Publix, and Giant Eagle with more to come soon",
  "icons": {
    "48": "icons/$Save.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.giantfood.com/*"
      ],
      "js": [
        "GiantCouponClicker.js"
      ]
    },
    {
      "matches": [
        "*://*.publix.com/*"
      ],
      "js": [
        "PublixCouponClicker.js"
      ]
    },
    {
      "matches": [
        "*://*.gianteagle.com/*"
      ],
      "js": [
        "GiantEagleCouponClicker.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/$Save.png",
    "default_title": "$Saver",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c51342dd-ebf7-4a03-a6e4-94af92994ac5}"
    }
  }
}