Examine source code of Savee

{
  "manifest_version": 2,
  "name": "Savee",
  "description": "Save inspiration from anywhere",
  "version": "3.0.21",
  "icons": {
    "16": "icon-16.png",
    "24": "icon-24.png",
    "48": "icon-48.png",
    "96": "icon-96.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "storage",
    "cookies",
    "contextMenus",
    "activeTab",
    "nativeMessaging",
    "https://dm.savee-cdn.com/*",
    "https://dr.savee-cdn.com/*",
    "https://m.savee-cdn.com/*",
    "https://st.savee-cdn.com/*",
    "https://savee.com/*"
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+S",
        "mac": "Alt+S"
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "content-scripts/content.css"
  ],
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{402499ae-5a16-40bb-ada7-759dc33035b9}"
    }
  }
}