security-and-privacy/CanvasBlocker
security-and-privacy
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CanvasBlocker
mirror of https://github.com/kkapsner/CanvasBlocker
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Version 0.2.2

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kkapsner 2015-12-07 16:42:03 +01:00
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commit 1193243d50
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30
README.md
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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:
<ul>
<li>block readout API: All websites not on the white list or black list can use the &lt;canvas&gt; API to display something on the page, but the readout API is not allowed to return values to the website.</li>
<li>fake readout API: Canvas Blocker's default setting, and my favorite! All websites not on the white list or black list can use the &lt;canvas&gt; API to display something on the page, but the readout API is forced to return a new random value each time it is called.</li>
<li>ask for readout API permission: All websites not on the white list or black list can use the &lt;canvas&gt; 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.</li>
<li>block everything: Ignore all lists and block the &lt;canvas&gt; API on all websites.</li>
<li>allow only white list: Only websites in the white list are allowed to use the &lt;canvas&gt; API.</li>
<li>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 &lt;canvas&gt; API each time it is called.</li>
<li>block only black list: Block the &lt;canvas&gt; API only for websites on the black list.</li>
<li>allow everything: Ignore all lists and allow the &lt;canvas&gt; API on all websites.</li>
</ul>
At present, only my domain (kkapsner.de) is whitelisted by default.
This add-on allows users to prevent websites from using the Javascript &lt;canvas&gt; API to fingerprint them. Users can choose to block the &lt;canvas&gt; 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 &lt;canvas&gt; fingerprinting can be found at http://www.browserleaks.com/canvas.
The different block modes are:
<ul>
<li>block readout API: All websites not on the white list or black list can use the &lt;canvas&gt; API to display something on the page, but the readout API is not allowed to return values to the website.</li>
<li>fake readout API: Canvas Blocker's default setting, and my favorite! All websites not on the white list or black list can use the &lt;canvas&gt; API to display something on the page, but the readout API is forced to return a new random value each time it is called.</li>
<li>ask for readout API permission: All websites not on the white list or black list can use the &lt;canvas&gt; 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.</li>
<li>block everything: Ignore all lists and block the &lt;canvas&gt; API on all websites.</li>
<li>allow only white list: Only websites in the white list are allowed to use the &lt;canvas&gt; API.</li>
<li>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 &lt;canvas&gt; API each time it is called.</li>
<li>block only black list: Block the &lt;canvas&gt; API only for websites on the black list.</li>
<li>allow everything: Ignore all lists and allow the &lt;canvas&gt; API on all websites.</li>
</ul>
At present, only my domain (kkapsner.de) is whitelisted by default.

2
package.json
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"main": "lib/main.js",
"author": "Korbinian Kapsner",
"license": "MPL 2.0",
"version": "0.2.1-Development",
"version": "0.2.2-Development",
"permissions": {"private-browsing": true}
}