Problem
When your ask some website with https head.you may met the problem secure connection failed Firefox browser.
The answer is tool-preferences-advanced-certifactes cancel Query OCSP Responder servers to confirm the current VA Lidity of certificates.
Now you can solve the problem.
Difference between RedHat Ubuntu Debian Kali
I think Linux becomes with some years.popular Linuxs.
One part,redhat, the other Debian.
Introduce Red Hat Linux
Red Hat Enterprise Linux charge RHEL (Red Hat Enterprise Linux operating system)
RPM (Red Hat Package Manager) Pack management. RPM
Yum(full name Yellow dog Updater, Modified)
Introduce Debian
Kali Linux & U Buntu Free Forever
dpkg (Debian Package Manager)
Apt (provided in the Advanced Packagetool(debian or Debian -based distributions))
Other
. so(Extension So):Shared Object, dynamically linked library
. o (Extensiono):objectfile,Compliedresult of C + + source file
Tar : Tape Archive
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KALI Linux Problems & Study Red Hat | Ubuntu