HIP modified firefox showip addon can be used for firefox to show when HIP is used instead of ipv4 or ipv6 addresses. HITs are simply determined from IP-address information trough HIP prefix. If using opportunistic mode, detecting whether using HIP or not wont work.
If you have HIPL source code: To install addon, open firefox and browse to folder where you have HIPL sources and go to folder showip. Then select showip*.xpi from that folder (example: "file:///path/to/hipl/showip/showip-hipmod-0.8.02-fx-mz.xpi"). Firefox should now prompt you with installation instructions.
Another way to get showip-package, is to download it from: http://hipl.hiit.fi/hipl/release/latest/showip-hipmod-latest-fx-mz.xpi. After download, firefox should prompt you with installation instructions.
Original showip-package: https://addons.mozilla.org/firefox/590/.