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Joined 3 months ago
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Cake day: April 13th, 2024

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  • Most firefox addons dont even have the permissions needed to change anything a website could observe.

    Very strong disagree, I have seen and used many very widely used extensions that manipulate the DOM, which IMO satisfies your criteria of “something that can be observed” i.e. by javascript with a fingerprint tracker like creepjs.

    Some examples:

    • ad blockers (uBO/uMatrix/etc.)

    • color/theme management (dark reader/dark theme/Stylish/etc.)

    • custom mouse cursor managers

    • page translators

    • addons serving in-browser ads

    • userscript managers (grease/tamper/violentmonkey etc.)

    • privacy blockers (CanvasBlocker/JShelter/etc.)

    • site-specific UI improvements (RES, SponsorBlock, youtube/SNS tweaks)

    All of these can be detected and included as yet another bit of data that a unique fingerprint can be built from.