In 1796 an anonymous book called A Peep into the Synagogue; or a Letter to the Jews appeared in London. Although it is assumed that it was written by a Jew (and indeed must have been, although perhaps one who converted to Christianity) I don't think it is known who wrote it to this day. Furthermore, copies are hard to come by. None of the digital archives seem to have it. However, below is a review which gives some interesting content:
And here's another review which takes the obnoxious tone by the author to task, calling it a "rude and illiberal attack." Even if the things are true, notes the reviewer, they ought to "be reproved by the gentle voice of candour":