Examine source code of Readwise Highlighter

{
  "name": "Readwise Highlighter",
  "homepage_url": "https://readwise.io",
  "version": "0.17.0",
  "manifest_version": 2,
  "minimum_chrome_version": "67",
  "browser_specific_settings": {
    "gecko": {
      "id": "team@readwise.io"
    }
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "background",
    "contextMenus",
    "notifications",
    "storage",
    "tabs",
    "unlimitedStorage"
  ],
  "description": "Save a page to Readwise Reader",
  "icons": {
    "128": "images/icon-128.png"
  },
  "browser_action": {},
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+R"
      }
    }
  },
  "content_scripts": [
    {
      "exclude_globs": [
        "https://ap.www.namecheap.com/*",
        "https://app.crowdmark.com/*",
        "https://app.dext.com/*",
        "https://local.readwise.io:3001/*",
        "https://local.readwise.io:8000/reader/extension*",
        "https://read.readwise.io/*",
        "https://read--*.readwise.io/*",
        "https://reader.readwise.io/*",
        "https://readwise.io/reader/extension*"
      ],
      "css": [
        "injection/index.css"
      ],
      "js": [
        "injection/index.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "persistent": true,
    "scripts": [
      "background/index.js"
    ]
  }
}