什么是Canvas Blocker - Fingerprint Protect？

Canvas Blocker - Fingerprint Protect是由joue.quroi开发的Chrome扩展程序，该扩展的主要功能是“Prevent HTML canvas element from generating a unique identification key to protect user's privacy”。

扩展截图

下载Canvas Blocker - Fingerprint Protect扩展crx文件

下载Canvas Blocker - Fingerprint Protect扩展crx格式的文件，手动将Chrome插件安装到浏览器中，也可以将crx文件分享给朋友，轻松安装Chrome插件。

扩展使用说明

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.

扩展基本信息

名称	Canvas Blocker - Fingerprint Protect
ID	nomnklagbgmgghhjidfhnoelnjfndfpd
官方URL	https://chromewebstore.google.com/detail/canvas-blocker-fingerprin/nomnklagbgmgghhjidfhnoelnjfndfpd
简介	Prevent HTML canvas element from generating a unique identification key to protect user's privacy
文件大小	59.76 KB
安装次数	28,018
当前版本	0.2.0
更新时间	2023-11-02
上架时间	2020-05-26
评分	4.06/5 共32次评分
开发者	joue.quroi
电子邮箱	[email protected]
付费类型	free
扩展官网	https://webextension.org/listing/canvas-fingerprint-blocker.html
帮助页面URL	https://webextension.org/listing/canvas-fingerprint-blocker.html
支持的语言	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" ] } ] }