Examine source code of Words Collector

{
  "manifest_version": 2,
  "name": "Words Collector",
  "version": "1.1resigned1",
  "description": "Collects words from web pages. Go to webpage and click \"Start Collecting\" .Then select word you want to collect and press \"CTRL + C\". Finally download collection by clicking \"Download Collection\" button",
  "homepage_url": "https://transzaar.com",
  "icons": {
    "16": "icons/icon-64.png",
    "32": "icons/icon-64.png",
    "48": "icons/icon-64.png"
  },
  "applications": {
    "gecko": {
      "id": "wordcollector@ebhashasetu.com",
      "strict_min_version": "52.0"
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "notifications",
    "<all_urls>",
    "downloads"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-64.png",
      "32": "icons/icon-64.png"
    },
    "default_title": "Words Collector",
    "default_popup": "popup/index.html",
    "browser_style": false
  },
  "background": {
    "scripts": [
      "my-background.js"
    ]
  },
  "author": "Sai Chereddy@ebhashasetu"
}