How Fugu is the Web? chrome extension

Version: 1.15.0
How Fugu is the Web?
An extension to shine light on the Project Fugu ? APIs web apps want to use.
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What is How Fugu is the Web??

How Fugu is the Web? is a api extension for chrome. also, it is manifest extension. it's a free extension , it has 61 active users since released its first version, it earns an average rating of 0.00 from 0 rated user, last update is 70 days ago.

What’s new in version 1.15.0?

                How it works

API data

The raw data for the different Project Fugu ? APIs is curated in a spreadsheet, which is then turned into JavaScript, so keeping the list of APIs updated is hopefully a straightforward task.

API detection

The extension monitors the requests a page makes via the chrome.webRequest.onBeforeRequest.addListener() API. Each response body, grouped by main frame, JavaScript, and Web App Manifest response bodies, is then run through a set of regular expressions like /navigator\.hid\.requestDevice\s*\(/g to determine if the code hints at a Project Fugu ? API potentially being used.

Browser support detection

Most Project Fugu ? APIs are easily feature-detectable by checking for the existence of interfaces or properties, for example, as in 'BarcodeDetector' in window. Other APIs require a ServiceWorkerRegistration, but luckily the popup window in Manifest V3 extensions uses a service worker, so it can be used via an IIFE that can be run in the client or the service worker. An example is (async () => 'periodicSync' in (await navigator.serviceWorker?.ready || self.registration))().

The support categories are listed below:

✔️ Supported by your browser.
? Not supported by your browser.
? Support unknown for your browser. (The only way to know would be user-agent sniffing.)


The extension makes use of Text Fragment URLs to deep-link to the occurrence of a detected API, for example For main frame documents, the source code gets rendered in a helper HTML page controlled by the extension, since it is impossible to link to view-source: protocol links.


• The chrome.webRequest.onBeforeRequest.addListener() API unfortunately does not "see" requests that are handled by a service worker ( There are three possible workarounds for this:
  - Hard-reload via ⌘/ctrl+shift+r.
  - Open DevTools and check the Bypass for network checkbox in the Service Worker section of the Application tab.
  - Clear storage in the Storage section of the Application tab.
• The extension only does static code analysis, that is, there is no guarantee that the app actually uses the code snippet where a Project Fugu ? API was detected.
• Heavily minified code will not be detected. For example, if an app minifies navigator.clipboard.write() to const nav = navigator; nav.clipboard.write(), the extension will not detect this.


Apache 2.0.            

How to install How Fugu is the Web??

You could download the latest version crx file or older version files and install it.

Preview of How Fugu is the Web?

Technical Features:

  • Latest Version: 1.15.0
  • Requirements: Windows Chrome, Mac Chrome
  • License: Free
  • Latest update: Wednesday, March 22nd, 2023
  • Author: Thomas Steiner

How Fugu is the Web? Available languages: