Examine source code of Text Case Changer

{
  "manifest_version": 2,
  "name": "Text Case Changer",
  "version": "1.0.6",
  "description": "Change Case of selected editable text.",
  "homepage_url": "https://github.com/JNavas2/Text-Case-Changer",
  "icons": {
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "64": "images/icon-64.png",
    "128": "images/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "images/icon-32.png",
    "default_title": "Text Case Change …",
    "default_popup": "popup.html"
  },
  "commands": {
    "lowerCase": {
      "description": "Change selection to lower case"
    },
    "upperCase": {
      "description": "Change selection to upper case"
    },
    "invertCase": {
      "description": "Invert the case of each letter in the selection"
    },
    "sentenceCase": {
      "description": "Change selection to sentence case"
    },
    "startCase": {
      "description": "Capitalize the first letter of each word in the selection"
    },
    "titleCase": {
      "description": "Change selection to title/headline case"
    },
    "camelCase": {
      "description": "Change selection to camelCase"
    },
    "snakeCase": {
      "description": "Change selection to snake_case"
    }
  },
  "browser_specific_settings": {
    "gecko_android": {
      "strict_min_version": "113.0"
    },
    "gecko": {
      "id": "{8109061d-e7b9-45e8-9b12-cd943b5f5b9a}"
    }
  }
}