This is a Firefox plugin that uses the Safebrowse API to check some characteristics of the URLs you are visiting.
First, you will pack the plugin using the command below (in the root of the repository):
zip -r ../safebrowse-extension.xpi *Then, you can add it to about:debugging by clicking on "Load Temporary Add-on" and selecting the safebrowse-extension.xpi file.
Now, every time you visit a URL, the plugin will show:
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Thirdparty connections made by the website
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The data storage at the user's device
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The cookies used by browser (first-party, third-party, session and persistent)
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Potential browser hijacking
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Canvas fingerprinting detection
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Privacy score of the website