Examine source code of Page Scroll Progress

{
  "manifest_version": 2,
  "name": "Page Scroll Progress",
  "version": "1.0",
  "description": "Track and control your scroll progress on any webpage with a progress bar and slider in a forest green interface.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a8ebec81-4c4a-4245-9363-47cbf98a242a}"
    }
  }
}