The point to my original comment is fingerprint of extensions isn’t straightforward or free, ie requires intentionally designing a fingerprinting technique tailored to identify its behaviour.
CreepJS can really only detect Chrome extensions and very few Firefox ones. On Firefox, it can detect NoScript but not uBlock for example. This isn’t to say that uBlock can’t be fingerprinted, just that it hasn’t yet in CreepJS. Some extension don’t touch the DOM at all or produce any fingerprintable behaviour to the web page, so there for can’t be detected. Some don’t produce weird behaviour until a user interacts with some element in the extension or webpage.
The point to my original comment is fingerprint of extensions isn’t straightforward or free, ie requires intentionally designing a fingerprinting technique tailored to identify its behaviour.
CreepJS can really only detect Chrome extensions and very few Firefox ones. On Firefox, it can detect NoScript but not uBlock for example. This isn’t to say that uBlock can’t be fingerprinted, just that it hasn’t yet in CreepJS. Some extension don’t touch the DOM at all or produce any fingerprintable behaviour to the web page, so there for can’t be detected. Some don’t produce weird behaviour until a user interacts with some element in the extension or webpage.