Wagner's most egregious antisemitism

[Chaszz]

I recall reading in Cosima's Diaries that Wagner exhibited glee when a fire (it was in Russia or France, I forget which) killed a considerable number of Jews. I have tried to find this passage again but to no avail. Since I don't read German, I can't use the concordance of her diaries recently published. Can anyone identify the volume and page of this incident for me? Thanks.

[Novi]

From Tom Kaufman, 'Wagner vs. Meyerbeer,' The Opera Quarterly 19.4 (2003) 644-669:

In her diary entry of 18 December 1881, Cosima Wagner wrote that her husband was telling her about a recent performance of Lessing's Nathan der Weise, during which a Jewish member of the audience stood up and shouted "bravo!" in response to a speech praising the Jews. Wagner, evidently remembering the Ringtheater fire (which Cosima describes as a vehement joke), remarked that "all Jews should burn to death at a performance of Nathan."

Is this what you're looking for? If so, the reference is:
Cosima Wagner'sDiaries, vol. 2, 1878 -1883, ed. Martin Gregor-Dellin and Dietrich Mack, trans. Geoffrey Skelton (New York: Harcourt Brace Jovanovich, 1977), pp. 772-73.