Hello Matias. I think that different versions of Vector have different default browsers, but it's easy to install the latest version of Firefox (using the GSLAPT package manager) and set it as your default browser if it's not already installed. Flash and most audio codecs are already installed so you can watch movies, view YouTube, Facebook etc without needing to install anything else. Pidgin is installed in some (all?) versions of Vector, but it can easily be installed if it's not already there.