Examine source code of Sessify

{
  "manifest_version": 2,
  "name": "Sessify",
  "description": "Manage and switch between multiple browser sessions effortlessly. Save and switch session with ease.",
  "version": "0.1.1",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "author": "Deri Kurniawan",
  "homepage_url": "https://sessify.derikn.com",
  "permissions": [
    "sidePanel",
    "cookies",
    "storage",
    "tabs",
    "activeTab",
    "scripting",
    "unlimitedStorage",
    "<all_urls>",
    "https://*/*",
    "http://*/*"
  ],
  "content_scripts": [
    {
      "js": [
        "content-scripts/content.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    },
    {
      "matches": [
        "*://*.google.com/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "commands": {
    "toggle-feature": {
      "suggested_key": {
        "default": "Alt+Shift+S",
        "windows": "Alt+Shift+S",
        "linux": "Alt+Shift+S",
        "mac": "Command+Shift+S",
        "chromeos": "Alt+Shift+S"
      },
      "description": "Toggle feature"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{65005012-da8c-4536-9b03-6248965f257d}",
      "strict_min_version": "58.0"
    }
  },
  "sidebar_action": {
    "default_panel": "sidepanel.html",
    "default_title": "Sidepanel"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Popup",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  }
}