Examine source code of EchoLive: Read, Listen, Create

{
  "manifest_version": 3,
  "name": "EchoLive: Read, Listen, Create",
  "version": "1.1.0",
  "description": "Save articles, feeds, and pages to EchoLive. Read, organize, search, and listen to any content.",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": "icons/icon-48.png",
    "default_title": "Save to EchoLive"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "scripting",
    "cookies",
    "alarms"
  ],
  "host_permissions": [
    "https://app.echolive.co/*",
    "https://echolive.app/*",
    "https://*/*",
    "file:///*"
  ],
  "commands": {
    "save-page": {
      "suggested_key": {
        "default": "Ctrl+Shift+S",
        "mac": "Command+Shift+S"
      },
      "description": "Save current page to EchoLive"
    },
    "highlight-selection": {
      "suggested_key": {
        "default": "Ctrl+Shift+H",
        "mac": "Command+Shift+H"
      },
      "description": "Highlight selected text"
    }
  },
  "background": {
    "service_worker": "background/service-worker.js",
    "scripts": [
      "background/service-worker.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@echolive.co",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent",
          "authenticationInfo"
        ],
        "optional": [
          "technicalAndInteraction"
        ],
        "has_previous_consent": false
      }
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "save-dialog/save-dialog.html",
        "save-dialog/save-dialog.js",
        "save-dialog/save-dialog.css",
        "image-save/image-save.html",
        "image-save/image-save.js",
        "panel/panel.html",
        "panel/panel.js",
        "panel/panel.css",
        "popup/popup.css",
        "lib/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "https://app.echolive.co/*",
        "https://echolive.app/*"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "content/content-highlight.js"
      ],
      "css": [
        "content/content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "sidebar_action": {
    "default_panel": "panel/panel.html",
    "default_title": "EchoLive",
    "default_icon": "icons/icon-48.png"
  }
}