Examine source code of RiteTag: Hashtag Generator

{
  "manifest_version": 2,
  "name": "RiteTag",
  "short_name": "RiteTag: Hashtag Generator",
  "description": "Get hashtag suggestions for images and texts on any site (great for Instagram, Pinterest, Twitter, Facebook, LinkedIn).",
  "version": "2.4.51",
  "homepage_url": "https://ritetag.com",
  "icons": {
    "16": "images/icon-16.png",
    "48": "images/icon-48.png",
    "256": "images/icon-256.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icon-19.png",
      "38": "images/icon-38.png"
    },
    "default_title": "RiteTag"
  },
  "web_accessible_resources": [
    "images/*",
    "fonts/*",
    "js/*"
  ],
  "background": {
    "scripts": [
      "js/jquery-3.2.1.js",
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/modal.js"
      ],
      "css": [
        "css/firefox.css"
      ],
      "all_frames": true
    }
  ],
  "permissions": [
    "storage",
    "tabs",
    "http://*/*",
    "https://*/*",
    "contextMenus",
    "notifications"
  ]
}