We notice that the structure is two lists of windows(Open and closed), which contains two lists of tabs (Open and closed), and then a bit of extra data. Time stamp for when the session started.Here are some things we can notice that the file contains: "url": "https://"title": "Billing Information - PayPal", "owner_b64": "NhAra3tiRRqhyKDUVsktxQAAAAAAAAAAwAAAAAAAAEYAAQAAAAAAAS8nfAAOr03buTZBMmukiq45X+BFfRhK26P9r5jIoa8RAAAAAAVhYm91dAAAAARob21lAODaHXAvexHTjNAAYLD8FKM5X+BFfRhK26P9r5jIoa8RAAAAAA5tb3otc2FmZS1hYm91dAAAAARob21lAAAAAA=", "owner_b64": "SmIS26zLEdO3ZQBgsLbOywAAAAAAAAAAwAAAAAAAAEY=", Here are the contents, having followed the above mentioned steps: It is a serialized state of the windows, closed windows, tabs, history, and closed tabs which is persisted on a regular basis. js extension (It contains no actual JavaScript code). The sessionstore.js is a simple JSON file, hence the. Close the Paypal tab which contains the sensitive information, such as credit card numberĪt this point we check out what is contained in the sessionstore.js file.Fill out some random information in the Paypal form for making a transaction (Note that I had not previously logged into Paypal from this machine, thus getting a form to do the full transaction).Browse to (This was *entirely* random, as it was the first page I found with a Paypal donate button).Here are the steps taken to showcase this feature: To test this, I had my VM with Procmon and a clean copy of the latest Firefox. Here we’ll take a look at what is stored by the browser, and how we can observe this. And unless users are aware, this could be potentially bad. It will assume a form field marked as password type to be bad to include, but could there be other concerns? The answer is: Yes. So it’s all nice and dandy, right? Well, the problem is that Firefox obviously can’t tell what data is sensitive and what isn’t. I use it on a regular basis, since I’ll often be trigger-happy on my close tab hotkeys. Personally, I find this to be an extremely neat feature. Firefox, much like other browsers, has been allowing you to restore browser “sessions”, which will restore the state of any page loaded, url, referrer, tab location, title, form data, the size of the rendering, font zooming, scrolling done on the page, closed tabs, and other fun things.
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