CanvasBlocker
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
EUPlatforms
- Mac
- Windows
- Linux
- Mozilla Firefox
Features
Properties
- Privacy focused
- Lightweight
Features
- No registration required
- Ad-free
- Block Trackers
- No Logs
- No Tracking
- Dark Mode
- Fingerprinting protection
Tags
- Security & Privacy
- fingerprinting
- digital-fingerprint
- fingerprint
- Privacy Protection
- canvas-fingerprint
CanvasBlocker News & Activities
Recent News
Recent activities
Featured in Lists
Software that values your privacy.
In this list, I'll give some suggestions on how to set up Windows for your less technically experienced family …
A list with 19 apps by AwesomeSauce32 without a description.
What is CanvasBlocker?
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 readout API. More information on <canvas> fingerprinting can be found at http://www.browserleaks.com/canvas.
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
CanvasBlocker information
Developed by
kkapsner Licensing
Open Source (MPL-2.0) and Free product.Written in
Alternatives
2 alternatives listedSupported Languages
- English
AlternativeTo Category
Security & PrivacyGitHub repository
- 1,406 Stars
- 94 Forks
- 65 Open Issues
- Updated
Comments and Reviews
Not a simple CanvasBlocker... like mosts
Protected "fingerprinting" APIs:
canvas 2d webGL audio history window (disabled by default) DOMRect
Eliminates a way for websites to track your web browsing activity
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