Examine source code of Anki-Add

{
  "manifest_version": 2,
  "name": "Anki-Add",
  "version": "1.3",
  "browser_specific_settings": {
    "gecko": {
      "id": "{71e42353-7fec-4033-ab9f-9d3d1a56af75}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "description": "Makes it easier to add japanese words directly in to anki.",
  "homepage_url": "https://github.com/Bluskyo/Anki-Add",
  "icons": {
    "128": "icons/anki-Add-Icon.svg"
  },
  "browser_action": {
    "default_icon": "icons/anki-Add-Icon.svg",
    "default_title": "Anki-add",
    "default_popup": "popup/info.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "js": [
        "highlightWord.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "web_accessible_resources": [
    "libs/fflate.min.js",
    "data/jmdictExtended.json.zip"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Q",
        "linux": "Ctrl+Shift+Q"
      },
      "description": "Open popup window."
    }
  }
}