this post was submitted on 30 Jul 2026
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Today I Learned

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TIL that you can get much lower online prices if you use a local library computer. Another reason to hate retailers.

Lora Kelley took a trip to the New York Public Library for us and compared prices against a personal iPhone. The results? A box of Apple Cinnamon Cheerios and a pack of toilet paper were nearly 20% cheaper on the library desktop.

https://www.mozillafoundation.org/en/nothing-personal/surveillance-dynamic-pricing-legal-groceries-tickets/

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[–] FlashMobOfOne@lemmy.world 1 points 10 minutes ago

Clear your cookies and use a VPN.

[–] 0ndead@infosec.pub 68 points 5 hours ago (1 children)
[–] atomicbocks@sh.itjust.works 35 points 3 hours ago (2 children)

That doesn’t help anymore. These days they use device identifiers and IP addresses and all kinds of stuff like that to see if you’re the same person or not. I would imagine that in this case going to your own laptop or desktop would result in the same prices.

If you really want to hide try a browser like the Mullvad browser that specifically resizes and changes things used for fingerprinting.

[–] jtrek@startrek.website 5 points 19 minutes ago

Device finger printing should be illegal.

[–] 0ndead@infosec.pub 5 points 3 hours ago* (last edited 3 hours ago) (1 children)
[–] atomicbocks@sh.itjust.works 17 points 3 hours ago (1 children)

Then choose a different one that does the same kind of fingerprinting protection, that’s why I said like Mullvad.

[–] Whirling_Ashandarei@lemmy.world 1 points 46 minutes ago

Heard good things about ivpn and am looking at them for my new one as my sub is running out shortly.

Funny that vpns are banned here.

[–] the_riviera_kid@lemmy.world 30 points 4 hours ago (3 children)

It's not the library, it's the cache you never clear. She could have done this just as easily at home on a browser with a private window she hadn't signed into.

[–] grue@lemmy.world 7 points 1 hour ago

It's also using an iPhone instead of a desktop PC. Retailers think all iPhone users are rich (or at least less price-sensitive).

[–] TrickDacy@lemmy.world 3 points 1 hour ago

Cache != Cookies

[–] klankin@piefed.ca 14 points 4 hours ago (1 children)

With the same IP, CPU, GPU, and networkcard??

Easily fingerprintable

[–] _haha_oh_wow_@sh.itjust.works 11 points 3 hours ago (2 children)

Easily obfuscated, but also just clearing cache or using private browsing will more likely than not work.

[–] klankin@piefed.ca 6 points 2 hours ago

Unless you're running a virtual GPU (and changing it often enough to remain anonymous), tracking pixels are pretty difficult to obfuscate (the exact thermal environment your PC is in will even effect timing).

And thanks to big tech this state of the art tracking is on essentially every website.

Clearing site data/private mode is a way to ask nicely that websites don't track you, but user intention hasn't been respected for around 3 decades by now.

[–] mpdarkguy@piefed.world 10 points 3 hours ago

I tried using waterfox and librewolf i think.

Every click on a new site was 5 capchas, its horrendously unusable, since probably they assume that all obfuscated user agent and other data are bots

[–] mvilain@fedia.io 15 points 4 hours ago

All the more reason to use a VPN.

[–] Seimhe@lemmy.world 14 points 5 hours ago (2 children)

Is it possible to instruct the browser, via extensions or something, to simply withhold that kind of information? I know websites need to render the page differently for different browsers and OS, but when it comes to things involving payment I'd rather deal with the browser quirks than get ripped off.

[–] grue@lemmy.world 4 points 1 hour ago* (last edited 1 hour ago)

Yes, but then that itself becomes a signal.

You have to not only resist fingerprinting, but do it in the same way as other people who resist fingerprinting.

[–] Beacon@fedia.io 18 points 4 hours ago

Only possible if you go to greater measures than just an extension.

https://understandingdata.com/posts/what-is-a-digital-fingerprint/