Examine source code of ANSI Viewer Plus

{
  "manifest_version": 2,
  "version": "4.0.0",
  "name": "ANSI Viewer",
  "description": "View ANSI file in the browser",
  "author": "eight",
  "homepage_url": "https://github.com/eight04/ansi-viewer",
  "permissions": [
    "contextMenus",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "*://*/*.ans",
    "*://*/*.ansi",
    "*://*/*.bbs",
    "file:///*"
  ],
  "background": {
    "scripts": []
  },
  "content_scripts": [
    {
      "matches": [
        "file:///*"
      ],
      "include_globs": [
        "*.ans",
        "*.bbs",
        "*.ansi"
      ],
      "js": [],
      "css": []
    }
  ],
  "commands": {
    "viewAsANSI": {
      "suggested_key": {
        "default": "Alt+A"
      },
      "description": "View current page as ANSI"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c8a058a7-51a2-4ea3-9dd5-c002ac960363}"
    }
  }
}