mirror of
https://github.com/kkapsner/CanvasBlocker
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22 lines
2.3 KiB
Plaintext
22 lines
2.3 KiB
Plaintext
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.
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The different block modes are:
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<ul>
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<li>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.</li>
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<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 <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.</li>
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<li>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.</li>
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<li>block everything: Ignore all lists and block the <canvas> API on all websites.</li>
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<li>allow only white list: Only websites in the white list are allowed to use the <canvas> API.</li>
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<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 <canvas> API each time it is called.</li>
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<li>block only black list: Block the <canvas> API only for websites on the black list.</li>
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<li>allow everything: Ignore all lists and allow the <canvas> API on all websites.</li>
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</ul>
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Firefox's native PDF reader uses the <canvas> API to display PDF content, so blocking it for MIME-content type of "*/pdf" will prevent the PDF reader from working. Therefore, the <canvas> API is enabled for PDFs by default, but it can be disabled without affecting the block mode setting.
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At present, only my domain (kkapsner.de) is whitelisted by default.
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Please report issues and feature requests at https://github.com/kkapsner/CanvasBlocker/issues
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A highly experimental version for Android is available at https://github.com/kkapsner/CanvasBlocker/tree/android
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