Examine source code of ECSBAS Bookmark Checker

{
  "manifest_version": 2,
  "name": "ECSBAS Bookmark Checker",
  "version": "1.2resigned1",
  "applications": {
    "gecko": {
      "strict_min_version": "52.0",
      "id": "{ebd196d4-54f8-4bba-9d61-db5a2e3249f1}"
    }
  },
  "description": "Access ECSBAS (https://github.com/cshu/ECSBAS/releases) bookmarks. Use shortcut (CTRL-Y by default) or click 3 times to add/check the active page. HTML can be saved as local archive, and compared with any future version when it's checked again.",
  "homepage_url": "https://github.com/cshu/ECSBAS/tree/master/webext",
  "icons": {
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "contentscr.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "options_ui": {
    "page": "options/options.htm"
  }
}