This was probably only an issue during migration from 3.0 to 3.5 in Karmic (and moving epiphany to webkit). The apturl package does install a gconf key to add an apt url handler, which both Firefox and Epiphany should support. The [Install] feature on the web site, also explicitly states it is for Jaunty, and not Karmic. We're installed in Karmic+ by default (on regular Ubuntu), though clicking [Install] (without installing the PPA package by clicking on [Add PPA]) should install the packages on Karmic if not already installed (this can be tested by removing python-ubuntuone-storageprotocol, and then clicking [Install]).
This was probably only an issue during migration from 3.0 to 3.5 in Karmic (and moving epiphany to webkit). The apturl package does install a gconf key to add an apt url handler, which both Firefox and Epiphany should support. The [Install] feature on the web site, also explicitly states it is for Jaunty, and not Karmic. We're installed in Karmic+ by default (on regular Ubuntu), though clicking [Install] (without installing the PPA package by clicking on [Add PPA]) should install the packages on Karmic if not already installed (this can be tested by removing python- ubuntuone- storageprotocol , and then clicking [Install]).