Examine source code of TextFast

{
  "manifest_version": 2,
  "author": "Matheus Faustino",
  "developer": {
    "name": "Matheus Faustino",
    "url": "https://github.com/matheusfaustino"
  },
  "name": "TextFast",
  "version": "1.4.0",
  "description": "It gives you opportunity of replacing boring words with easier ones or type memes faster ¯\\_[ツ]_/¯ (shrug).",
  "permissions": [
    "notifications",
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "text-replacer.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "public/config.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "textfaster@matheusfaustino.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}