RxJS uses the observer pattern and is not really FRP in the Haskell sense of things.
This is implemented in pure vanilla JavaScript.
You should pick RxJS. frpjs is new and has a long way to go. Conceptually it is different.
It is similar, though more on the lines of the video on the github page.
Fixed. Works on Chrome, Firefox, Safari, IE
Yes. Tested on Google chrome only. Support for other browsers coming.