Examine source code of Assignment Tracker++

{
  "name": "Assignment Tracker++",
  "version": "1.0.4",
  "manifest_version": 2,
  "description": "Changes new tabs page into an assignments tracker, editable directly & via right-clicking on assignments.",
  "author": "Natalie Stewart",
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "chrome_settings_overrides": {
    "homepage": "newtab.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "background": {
    "scripts": [
      "menu.js"
    ],
    "persistent": true
  },
  "icons": {
    "32": "icon32.png",
    "128": "icon128.png"
  },
  "permissions": [
    "contextMenus",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "assignment_tracker@fakemail.com",
      "strict_min_version": "57.0"
    }
  }
}