This question is regarding common browsers, even though I may refer to Firefox settings. Not IE though, I wouldn't expect that to be in any way secure.
I'm seeking to know how secure it is to let the browser leave data on the computer after I close it. For all it's worth, I'm regarding to security as malware not being able to extract your data. A thief sitting on your already logged in computer is besides the point.
I'm sure in the past this was definitely not secure. That is why I have kept the habit of having Firefox clear every data open close (or install an add-on for chrome to do that1). Admittedly though, it's not at all convenient. I wouldn't save passwords, form and search history, browse history etc anyway, but clearing cookies and active logins means I spend some time every time I open a browser just to login to various websites that I commonly visit.
My question is regarding how the browsers (probably needs different answers for each browser) store information and how secure are they? In particular, how secure is the storage of each of these elements?
- Active logins
- Offline website data
- Site preferences
(The terms taken from Firefox settings, where you choose what information to clear upon exit).
1 Is chromium so secure (or so it thinks) that it doesn't need to clear stored data?
P.S. I have seen this question, which seems to be Windows specific. I use both Windows and Ubuntu, so this question is entirely answered by the other one.