That is, if you know about some existing and working broswer-app being open source, please post this here. d5000 already mentioned PeerName, but I am not sure if this project is open source.
I just saw that
Blockchain DNS is also available for Firefox (and Chrome, as I already wrote), according to its own webpage. It has a
Github repository, and is open source (Unlicense = Public Domain software). I had never seen this project before, so I still didn't test it but I'll give it a try (at a first glance, on Chromium it works fine, while I couldn't test it that easily with my FF because I use the older ESR version and it requires FF 55).
Thanks d5000. This project looks promising. I have the same problem with the firefox version number. There are Linux-distros which are behind the current firefox version so that the addon won't work. Nevertheless, I will look into the github repository.
The project, however, like PeerName, uses a centralized server to resolve the .bit domains. But as far as I understand the website you could set up your own service to do this. Maybe one can take this as a base for a totally decentralized application, e.g. where you can simply put in the IP of the server to do the "hard work" via an easy user interface?
Hmm ... I think some "centralized" server is always necessary, otherwise people must download and maintain their own copy of the namecoin blockchain. This restricts usability too much. Or is there something like a light client for namecoin which only keeps track of the domain names?
If I mix-up too many concepts, please correct me.