As asked in the title. I clicked on one of the links in the Quantal installer (set up via UNetbootin) and it launched Firefox.
Will using it for a longer time during install cause conflict with language packs that I'm installing (example: Polish)?
Should be fine. Might cause the install to take a little longer, but probably nothing serious, especially if it's just random browsing and not, for example, playing big heavy Flash games at a site like Kongregate (assuming you even have Flash available in the installer environment, which I don't know the answer to off the top of my head).