Examine source code of AudioPapers

{
  "manifest_version": 2,
  "name": "AudioPapers",
  "version": "0.6",
  "description": "AudioPapers fetches full text, metadata, and sources from any news story you find on Google News.",
  "homepage_url": "https://www.audiopapers.com",
  "icons": {
    "16": "icon_16.png",
    "32": "icon_32.png",
    "64": "icon_64.png",
    "128": "icon_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6654ef2f-0944-4bf0-909e-aee91c2e1373}",
      "strict_min_version": "128.0"
    }
  },
  "browser_action": {
    "default_icon": "icon_32.png",
    "default_title": "AudioPapers: Get Sources"
  },
  "permissions": [
    "contextMenus",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "activeTab",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://app.audiopapers.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ]
}