Examine source code of TextForma SE

{
  "manifest_version": 2,
  "name": "TextForma SE",
  "id": "addon@textforma.com",
  "version": "0.1.22",
  "default_locale": "ja",
  "description": "__MSG_description__",
  "permissions": [
    "storage",
    "tabs"
  ],
  "icons": {
    "16": "images/shield-icon16.png",
    "48": "images/shield-icon48.png",
    "128": "images/shield-icon128.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "match_about_blank": true,
      "run_at": "document_start",
      "all_frames": true,
      "js": [
        "scripts/core.js",
        "scripts/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/shield-icon16.png",
      "48": "images/shield-icon48.png"
    }
  },
  "options_ui": {
    "page": "html/options.html",
    "browser_style": true
  }
}