Canvas Blocker - Fingerprint Protectとは何ですか？

Canvas Blocker - Fingerprint Protectはjoue.quroiによって開発されたChromeの拡張機能で、その主な機能は「Prevent HTML canvas element from generating a unique identification key to protect user's privacy」です。

拡張機能のスクリーンショット

Canvas Blocker - Fingerprint Protect拡張機能のCRXファイルをダウンロード

Canvas Blocker - Fingerprint Protect拡張子のファイルをcrx形式でダウンロードし、ブラウザにChrome拡張機能を手動でインストールするか、crxファイルを友達と共有して簡単にChrome拡張機能をインストールします。

拡張機能の使用方法

This browser extension safeguards user privacy by preventing malicious scripts from using the HTML canvas element for user fingerprinting. It introduces slight changes to the data generated by the canvas element when specific methods are invoked, rendering it unusable for fingerprinting. In comparison to similar extensions, this one is lighter and employs a more efficient method to obstruct fingerprinting across all frame elements (top and subframes). The extension operates in three modes:

1. Random noise
2. Random noise (per page) to maintain a consistent identity within the current page session
3. Fixed noise to sustain a constant yet unique identity continuously

Key Features:
1. Minimal footprint fingerprint defender
2. Ability to block or disable fingerprinting on specific hostnames
3. Notification when canvas fingerprinting is detected
4. Option to disable notification for select or all hostnames
5. Compatibility with cross-origin (CORS) and sandboxed iframes (such as Disqus and Hangouts)

Notes:
This extension doesn't entirely block the canvas element. Instead, it modifies two methods to prevent the JavaScript engine from creating a unique identification key from this element.

What is Canvas Fingerprinting:
Canvas fingerprinting is a method among several browser fingerprinting techniques used for tracking online users. It enables websites to identify and monitor visitors by leveraging the HTML5 canvas element rather than browser cookies or similar means. This technique functions by exploiting the HTML5 canvas element. When a user visits a webpage, the fingerprinting script initially writes text using the preferred font and size and adds background colors. Subsequently, the script calls the Canvas API's ToDataURL method to retrieve canvas pixel data in dataURL format, essentially a Base64 encoded representation of binary pixel data. Lastly, the script hashes the text-encoded pixel data, creating a unique fingerprint.

拡張機能の基本情報

名前	Canvas Blocker - Fingerprint Protect
ID	nomnklagbgmgghhjidfhnoelnjfndfpd
公式URL	https://chromewebstore.google.com/detail/canvas-blocker-fingerprin/nomnklagbgmgghhjidfhnoelnjfndfpd
説明	Prevent HTML canvas element from generating a unique identification key to protect user's privacy
ファイルサイズ	59.76 KB
インストール数	28,018
現在のバージョン	0.2.0
最終更新日	2023-11-02
公開日	2020-05-26
評価	4.06/5 合計 32 レビュー
開発者	joue.quroi
Eメール	[email protected]
支払い方法	free
拡張機能のウェブサイト	https://webextension.org/listing/canvas-fingerprint-blocker.html
ヘルプページのURL	https://webextension.org/listing/canvas-fingerprint-blocker.html
対応言語	en
manifest.json
{ "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx", "manifest_version": 3, "version": "0.2.0", "name": "Canvas Blocker - Fingerprint Protect", "description": "Prevent HTML canvas element from generating a unique identification key to protect user's privacy", "icons": { "16": "\/data\/icons\/16.png", "32": "\/data\/icons\/32.png", "48": "\/data\/icons\/48.png", "64": "\/data\/icons\/64.png", "128": "\/data\/icons\/128.png", "256": "\/data\/icons\/256.png", "512": "\/data\/icons\/512.png" }, "permissions": [ "notifications", "storage", "contextMenus", "scripting" ], "host_permissions": [ ":\/\/\/" ], "homepage_url": "https:\/\/webextension.org\/listing\/canvas-fingerprint-blocker.html", "background": { "service_worker": "worker.js" }, "action": [], "options_ui": { "open_in_tab": true, "page": "\/data\/options\/index.html" }, "content_scripts": [ { "world": "MAIN", "matches": [ ":\/\/\/" ], "match_about_blank": true, "match_origin_as_fallback": true, "all_frames": true, "run_at": "document_start", "js": [ "\/data\/inject\/main.js" ] }, { "world": "ISOLATED", "matches": [ ":\/\/\/*" ], "match_about_blank": true, "match_origin_as_fallback": true, "all_frames": true, "run_at": "document_start", "js": [ "\/data\/inject\/isolated.js" ] } ] }