To get rid of bugs, it is recommended that you update your Firefox version. The new 18.0.2 works perfect on Ubuntu 12.10 Quantal Quetzal, Ubuntu 12.04 Precise Pangolin, Ubuntu 11.10 Oneiric Ocelot and Ubuntu 10.04 Lucid Lynx.
Download Mozilla Firefox 18.0.2 from the official Mozilla ftp’s:
For 32 bit architecture:
$ wget ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/18.0.2/linux-i686/en-US/firefox-18.0.2.tar.bz2
For 64 bit architecture:
$ wget ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/18.0.2/linux-x86_64/en-US/firefox-18.0.2.tar.bz2