Examine source code of My Hours Time tracker

{
  "manifest_version": 2,
  "name": "My Hours Time Tracker",
  "version": "1.4.8",
  "applications": {
    "gecko": {
      "id": "ff-extension@myhours.com",
      "strict_min_version": "58.0"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ff-extension@myhours.com",
      "strict_min_version": "58.0"
    }
  },
  "description": "My Hours Time Tracker",
  "browser_action": {
    "default_popup": "index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://app.clickup.com/*",
        "https://app.asana.com/*",
        "https://*.monday.com/*",
        "https://*.basecamp.com/*"
      ],
      "js": [
        "/jquery.min.js",
        "/select2.min.js",
        "/content.js",
        "/atlassian.js"
      ],
      "css": [
        "/select2.min.css",
        "style.css"
      ]
    }
  ],
  "icons": {
    "16": "mh_logo_128_gray.png",
    "48": "mh_logo_128_gray.png",
    "128": "mh_logo_128_gray.png"
  },
  "web_accessible_resources": [
    "mh_logo_128.png",
    "mh_logo_128_gray.png",
    "style2.css",
    "style.css"
  ],
  "permissions": [
    "activeTab",
    "https://api2.myhours.com/*",
    "https://login.myhours.com/*",
    "storage",
    "tabs",
    "identity"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}