Examine source code of rdltr

{
  "name": "rdltr",
  "description": "save articles with rdltr to read them later.",
  "author": "SamR1",
  "homepage_url": "https://github.com/SamR1/rdltr-addon",
  "version": "0.1.2",
  "manifest_version": 2,
  "icons": {
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "browser_action": {
    "default_title": "rdltr",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "permissions": [
    "*://*/",
    "activeTab",
    "storage"
  ],
  "options_ui": {
    "page": "options/options.html",
    "chrome_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{00eaa2f7-1612-4aef-a360-4f9f6aefa7a9}"
    }
  }
}