To disable it altogether, go to about:config and disable.
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In Firefox for mobile devices (Google Android and Nokia Maemo), Firefox will ask for permission if a site tries to use more than 5MB If it tries to use more than 50MB, Firefox will ask the user for permission It seems the following from August 2011 may still apply (where "" is added by me):īy default in Firefox 4, a site can use up to 50MB of IndexedDB storage.
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While about:permissions does not work in my Firefox 55, going into Tools, Page Info, Permissions I get the button "Clear Storage":Įven worse, neither the greyed-out "Use Default: Always Ask" in the above screen capture, nor enabling "Tell you when a website asks to store data for offline use" in settings, Advanced, Network, have any effect to avoid storage: The right way to delete this data is by going to about:permissions address, look for the domain and pressing the Forget About This Site button. Like in March 2015, someone wrote:īut even when you delete all your history information the data from IndexedDB persist. Not clearing it sounds like a bug in Firefox indeed, but apparently the developers feel otherwise. Because it lets you create web applications with rich query abilities regardless of network availability, your applications can work both online and offline.
IndexedDB is a way for you to persistently store data inside a user's browser. The website is using IndexedDB, for which MDN writes: How can I protect from this kind of "super-tracking" used by this website?.How on earth are they able to reidentify me? Since their only motivation to reidentify me is to offer access to previously used mail addresses, I don't think they use any "dark" techniques like fingerprinting, but of course it can't be ruled out.Microsoft Edge, after deleting browser history, doesn't allow reidentification. (Update) Other browsers are not affected.(It's not Flash cookies, the website doesn't use Flash!) This might indicate that there is some kind of storage for websites that can't be accessed or deleted though Firefox. Actually, it is sufficient to use the Firefox addon Priv8 and create a new sandbox to be identified as a different person. When I use a different browser or a new browser profile, the website doesn't reidentify me as the same person. My "identity" must somehow be bound to my current browser profile.Use a VPN (that according to their claims is safe against IPv6 and DNS leaking) that I have not used when I previously visited this website.Basically everything that can be deleted through the Firefox menu.
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