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There's at least one proxy service (trendmicro) that sends occasional duplicates of GET requests as some sort of probe for malware. You shouldn't be alarmed, and your GET requests ought to be idempotent anyway.


Yes it can, for example using : Ajax A reference to an external JS or css file An iframe or even a HTTP 302 redirect. This can be used by online malware to generate trafic for a DDoS Attack. Note, all those are used for legitimate purpose on many (most) websites, and hence do not imply a malicious behavior. In response to your edit: Yes, Ajax can do ...


The private key is need by Firefox for client authentication, i.e. when the client demonstrates to the server ownership of a certificate. By definition, this requires knowledge of the private key on the client side. This does not happen often, because most Web servers authenticate clients with passwords, not with certificates. Of course, Firefox has no need ...


.p12/pfx doesnt neccesarily mean it contains a private key, import it to your keystore to see if you can verify if you have access to the private key.


The Perspective addon does distributed certificate pinning. Certificate pinning means to associate a particular certificate to a particular host, so that any changes can be noted. This is mainly to help prevent man-in-the-middle (MITM) attacks. For example, say that when you visit https://www.eff.org/ on Monday, the security certificate for that site was ...


There are tools that are using OpenPGP.js for encrypting data on your browser. For example, Mailvelope is one of them.

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