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SSL certificates usually come with the OS or the browser. AFAIK there's no easy way for the ISP to add certificates.

• duskwuff 16y ago
  Unless they are a government entity which is recognized as a certificate authority, or which can exert influence over one.
• gcb 16y ago
  But there are millions of ways to provide you their version of firefox_installer.exe with the 'right' certificates.