Examine source code of Custom Characters

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "3.0",
  "applications": {
    "gecko": {
      "id": "customcharacters@mtalbot.addons.mozilla.org",
      "strict_min_version": "61.0"
    }
  },
  "icons": {
    "32": "icons/customcharacters-32.png",
    "48": "icons/customcharacters-48.png",
    "64": "icons/customcharacters-64.png",
    "96": "icons/customcharacters-96.png"
  },
  "default_locale": "en",
  "permissions": [
    "notifications",
    "storage"
  ],
  "commands": {
    "toggle-list1": {
      "suggested_key": {
        "default": "Ctrl+Period"
      }
    },
    "toggle-list2": {
      "suggested_key": {
        "default": "Ctrl+Comma"
      }
    }
  },
  "options_ui": {
    "browser_style": false,
    "page": "pages/ccoptions.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "ccforeground.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "ccbackground.js"
    ]
  }
}