Examine source code of D-Chat

{
  "version": "6.3.0",
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "short_name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "author": "losnappas",
  "background": {
    "page": "./background.html"
  },
  "browser_action": {
    "default_icon": "img/NKN_D-chat_blue-64cropped.png",
    "default_popup": "./popup.html",
    "theme_icons": [
      {
        "dark": "img/NKN_D-chat_blue-64cropped.png",
        "light": "img/NKN_D-chat_white-64cropped.png",
        "size": 32
      }
    ]
  },
  "permissions": [
    "storage"
  ],
  "optional_permissions": [
    "notifications"
  ],
  "sidebar_action": {
    "default_title": "__MSG_extensionName__",
    "default_panel": "./index.html",
    "open_at_install": false,
    "default_icon": "img/NKN_D-chat_blue-64cropped.png"
  },
  "icons": {
    "16": "img/NKN_D-chat_blue-16.png",
    "64": "img/NKN_D-chat_blue-64cropped.png",
    "128": "img/NKN_DCHAT-128-128-border16.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dchat@losnappas"
    }
  },
  "options_ui": {
    "page": "./options.html",
    "open_in_tab": true
  }
}