Examine source code of ime-mode-we

{
  "manifest_version": 2,
  "name": "ime-mode-we",
  "version": "1.0",
  "description": "Set ime-mode by WebExensions",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "ime-mode.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "ime-mode-we@clear-code.com",
      "strict_min_version": "60.0"
    }
  },
  "permissions": [
    "nativeMessaging"
  ]
}