You can see his antisemitic conspiracy-theorizing, and vivid Oriental imagination, here.
As for Benjamin Franklin, that quoted prophecy was an invention of William Dudley Pelley, the head of the fascistic Silver Shirts in the U.S. in the 1930s. You can find out more about Pelley, and other of Hitler's admirers, such as Fritz Kuhn of the Bund, in John Roy Carlson's "Under Cover."
Here is a comment to a piece posted last July by Christina about Muslim attempts to describe Shaw as an admirer of Islam, the very opposite of the truth:
11 Jul 2013
The repeated attempts by Muslims to make up, and disseminate, supposed quotations from well-known non-Muslims expressing their admiration for Islam, as here, goes hand-in-hand to hell with the use, by Arab and Muslim propagandists, of antisemitic material lifted from the rich profusion of such stuff in the West. For example, "The Protocols of the Elders of Zion" for years was passed out by Saudi King Fahd to visiting Westerners, and the same forgery has been used as the basis of many articles, and a celebrated Egyptian television series broadcast within the last decade).
Another favorite is the quote, never uttered by but attributed to Benjamin Franklin, supposedly including his warning about the nefarious influence of Jews. The quote appears to have been made up by William Dudley Pelley, he of the Silver Shirts, during the 1930s (see John Roy Carlson's "Under Cover" for more).
Here's a bit more about the Franklin "Prophecy" which I found at Wikipedia:
"The Franklin Prophecy", sometimes called "The Franklin Forgery", is an antisemitic speech falsely attributed to Benjamin Franklin, warning of the supposed dangers of admitting Jews to the nascent United States. The speech was purportedly transcribed by Charles Cotesworth Pinckney during the Constitutional Convention of 1787, but was unknown before its appearance in 1934 in the pages of William Dudley Pelley's Silver Legion pro-Nazi weekly magazine Liberation. (Pinckney wrote that he had kept a journal of the Convention, but it has never been found, and Pelley's claims that it was printed privately, and that the Franklin Institute has a manuscript copy, are unsubstantiated.)
Despite having been repeatedly discredited since its first appearance, the "prophecy" has proved a remarkably durable antisemitic canard. It has appeared most recently as a popular internet hoax promulgated on Usenet groups and antisemitic websites, where it is presented as authentic. On February 18, 1998, a member of the Fatah Central Committee revived this myth and mistakenly referred to Franklin as a former President of the United States. Osama Bin Laden used this canard briefly in his October 2002 "Letter to the American People". While its author is not known, many who have investigated the "prophecy" suspect Pelley of having penned it himself.[and it is from Osama Bin Laden, or perhaps from Fatah, that Mohamed Sobhi picked up his dreamy misinformation about Benjamin Franklin]
The U.S. Congress report Anti-Semitism in Europe: Hearing Before the Subcommittee on European Affairs of the Committee on Foreign Relations (2004) states:
The Franklin "Prophecy" is a classic anti-Semitic canard that falsely claims that American statesman Benjamin Franklin made anti-Jewish statements during the Constitutional Convention of 1787. It has found widening acceptance in Muslim and Arab media, where it has been used to criticize Israel and Jews...
Similar false antisemitic quotations have been attributed to George Washington and have been debunked. In 1790, in a marked sign of religious tolerance, Washington sent a letter to the Jewish community in Rhode Island, writing "May the Children of the Stock of Abraham, who dwell in this land, continue to merit and enjoy the good will of the other Inhabitants; while every one shall sit under his own vine and fig tree, and there shall be none to make him afraid."Use of 19th- and 20th-century antisemitic terminology shows that the supposed "Franklin Prophecy" is a forgery, as Benjamin Franklin died in 1790.
'The American President, Benjamin Franklin! Thanks, I need the comic relief. "Imaginative history" ? Your too kind Hugh.