CanvasBlocker

19 likes

This add-on allows users to prevent websites from using the Javascript <canvas> API to fingerprint them. Users can choose to block the <canvas> API entirely on some or all websites (which may break some websites) or just block or fake its fingerprinting-friendly...

Cost / License

Free
Open Source (MPL-2.0)

Origin

Germany
EU

Platforms

Mac
Windows
Linux
Mozilla Firefox

Alternatives

19likes

2alternatives

0articles

Features

Properties

Privacy focused
Lightweight

Features

No registration required
Ad-free
Block Trackers
No Logs
No Tracking
Dark Mode
Fingerprinting protection

CanvasBlocker News & Activities

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Recent activities

xpey liked CanvasBlocker
11 months ago
goodemerald liked CanvasBlocker
11 months ago

Comments and Reviews

Top Positive Comment

_Dark /L

★★★★★

Oct 20, 2018

Not a simple CanvasBlocker... like mosts

Protected "fingerprinting" APIs:

canvas 2d webGL audio history window (disabled by default) DOMRect

headlines

★★★★★

Sep 2, 2020

Eliminates a way for websites to track your web browsing activity

eileenomurphy

CommentAug 19, 2019

I just downloaded it, and I have not had time to adequately test it. So far, so good, with preliminary tests. I have been using Canvas Defender for years, and I love it! Canvas defender no longer works on Chrome/ Chromium based browsers. Because of that, I uninstalled my Chrome/Chromium Browsers except Epic Privacy Browser, which I love. In addition I am using the latest Firefox, and Firefox Nightly I am still using Canvas Defender on Firefox. On Firefox Nightly, I noticed a strange hashtag notice when I changed it. I change the hashtag, manually before closing the browser, each time, instead of using auto-change mode. The notification box seemed to assing an id/hashtag value to the Nightly browser that stayed the same, regardless of how many times that I repeated the process many times and although the regular hash value changed every time, the id for "Nightly" stayed the same. I am concerned about the compatibility of Canvas Defender with Nightly. It still does NOT do this with regular Firefox! Because of this, I downloaded CanvasBlocker to use in the "false mode". When I have time, I will do extensive testing for both Canvas Defender and CanvasBlocker on Nightly and let you know the results. -E

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What is CanvasBlocker?

The different block modes are:

• block readout API: All websites not on the white list or black list can use the <canvas> API to display something on the page, but the readout API is not allowed to return values to the website. • fake readout API: Canvas Blocker's default setting, and my favorite! All websites not on the white list or black list can use the <canvas> API to display something on the page, but the readout API is forced to return a new random value each time it is called. • fake at input: on display of text the drawn pixels get modified slightly. This makes the detection of the add-on harder but is less secure. On WebGL-canvas the behaviour is identical to "fake readout API". • ask for readout API permission: All websites not on the white list or black list can use the <canvas> API to display something on the page, but the user will be asked if the website should be allowed to use the readout API each time it is called. • block everything: Ignore all lists and block the <canvas> API on all websites. • allow only white list: Only websites in the white list are allowed to use the <canvas> API. • ask for permission: If a website is not listed on the white list or black list, the user will be asked if the website should be allowed to use the <canvas> API each time it is called. • block only black list: Block the <canvas> API only for websites on the black list. • allow everything: Ignore all lists and allow the <canvas> API on all websites.

Protected "fingerprinting" APIs:

• canvas 2d • webGL • audio • history • window (disabled by default) • DOMRect