什麼是Canvas Blocker - Fingerprint Protect？

Canvas Blocker - Fingerprint Protect是由joue.quroi開發的Chrome擴展程式，該擴展的主要功能是“Prevent HTML canvas element from generating a unique identification key to protect user's privacy”。

擴展截圖

下載Canvas Blocker - Fingerprint Protect擴展crx文件

下載Canvas Blocker - Fingerprint Protect擴展crx格式的文件，手動將Chrome擴充功能安裝到瀏覽器中，也可以將crx文件分享給朋友，輕鬆安裝Chrome擴充功能。

擴展使用說明

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.

擴展基本資訊

名稱	Canvas Blocker - Fingerprint Protect
ID	nomnklagbgmgghhjidfhnoelnjfndfpd
官方網址	https://chromewebstore.google.com/detail/canvas-blocker-fingerprin/nomnklagbgmgghhjidfhnoelnjfndfpd
簡介	Prevent HTML canvas element from generating a unique identification key to protect user's privacy
檔案大小	59.76 KB
安裝次數	28,018
目前版本	0.2.0
更新時間	2023-11-02
上架時間	2020-05-26
評分	4.06/5 共 32 次評分
開發者	joue.quroi
電子郵箱	[email protected]
付費類型	free
擴展官網	https://webextension.org/listing/canvas-fingerprint-blocker.html
說明頁面URL	https://webextension.org/listing/canvas-fingerprint-blocker.html
支援的語言	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" ] } ] }