Avast Password and portable browsers

Can Avast Password (Avast 2016) be used with portable browsers such as Firefox Portable or Chromium Portable?
I tried but, as I expected, it seems to be unable to “see” those browsers.

Is there any way to manually install the proper extensions in those browsers and have Avast Password work while the browsers mantain their “portability” (no messing with Windows registry) and obviously loose passwords in case they are used in another computer?

Thanks