I’ve enabled “Delete cookies and site data when Firefox is closed” but while all cookies gets deleted, some random site data does not. Are my settings wrong, is this a bug, and what even is that data?

Additional Info: I use RFP, want to keep browsing history and site settings. Thank you very much.

  • @HarriPotero
    8•1 month ago

    Sounds like it’s localStorage. But I’d expect that to be covered by “site data” in that option.

    It’s a bit like cookies, but just for one site. Some think they can avoid cookie consent banners with localStorage.

    Firefox has a page on the topic.

  • @[email protected]English
    5•1 month ago

    What is the data it’s keeping? 25-100 bytes doesn’t seem like there’s anything actually there.

    • @[email protected]
      0•1 month ago

      8 bytes is enough to store 18,446,744,073,709,551,616 (18 quintillion) different values, more than enough space for a fingerprint ID. The size of the data shouldn’t factor into the potential threat.

      • @[email protected]English
        4•1 month ago

        Oh for sure, I just wonder if the size being the same on 2 of them is a result of Firefox storing some default data there on cleanup by accident.

        • @[email protected]
          2•1 month ago

          Oh, I get it now! In my sleep deprived state I missed that two of them had the same size. That seems like a reasonable guess, I’m just paranoid about cookies :P

      • Lucy :3
        2•1 month ago

        Except the actual content is very likely boilerplate stuff.

        • @[email protected]
          7•1 month ago

          My point still stands. The size of data says nothing about its contents. If OP is concerned about this from a security or privacy perspective, you shouldn’t be writing them off because it’s only 100 bytes.