Is there a way to configure Firefox either through an add-on, plugin, or other setting that will either reject or warn whenever it encounters a certificate that has been signed using SHA-1?

  • this discribes how to disable RC4 Ciphers – bhavicp Nov 5 '14 at 3:04

If you want a warning you could use various Firefox plugins:

  • SSleuth It shows a value of how secure your connection is - SHA-1 leads to low score.
  • CipherFox Similar, but warning not very prominent.
  • CipherFox Secure Fork of the above with more features.

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