If you mean I2PBrowser from I2P devs, its nice great idea but its very alpha and very unmaintained currently e.g:
- I2Pbrowser not signed #2530
- NoScript just on the plugin level/effect not browser level #2536
- Its not catching up with firefox/TB updates thus it has all major security vulns not fixed e.g #2570
- NoScript default allowed websites not removed #2559
- I2Pbrowser now includes I2Pj within it , mean I2Pj installed in the OS wont effect I2Pbrowser thus useless to our case.
and on top of that meeh/mikalv the maintainer of I2Pbrowser is not really active (at the moment missing since months).