code, kbd, pre, samp {
  font-family: monospace !important;
}

@-moz-document domain(github.com) {
  .blob-code-inner,
  .blob-num,
  .commit-ref,
  .commit-tease-sha,
  .file-info,
  .sha,
  .sha-block {
    font-family: monospace !important;
  }

  .blob-code-inner,
  .blob-num,
  .file-info {
    font-size: 14px !important;
  }
}

code, kbd, pre, samp {
  font-family: monospace !important;
}

.ace_cursor {
  animation: none !important;
}

@-moz-document domain(github.com) {
  .blob-code-inner,
  .blob-num,
  .commit-ref,
  .commit-tease-sha,
  .file-info,
  .sha,
  .sha-block {
    font-family: monospace !important;
  }

  .blob-code-inner,
  .blob-num,
  .file-info {
    font-size: 14px !important;
  }
}

Disable cursor animation in ACE editor
firefox: Disable cursor animation in ACE editor

Increases CPU usage, and matches cursor configuration in other editors.
