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Sets the "mode" for the browser.
Historically, the 'browser' argument for getNewBrowserSession implied the mode for the browser. For
example, *iehta indicated HTA mode for IE, whereas *iexplore indicated the default user mode. Using
this method allows a browser mode to be specified independently of the base browser, eg. "HTA" or
"PROXY".
Note that absolutely no publication nor synchronization of these hard-coded strings such as "HTA" has
yet been done. Use at your own risk until this is rectified.