2
See
this link."Installing Firefox
Once you have downloaded a Firefox installer or compressed archive, follow these instructions to install:
First, if you are running an old version of *Firebird* or *Phoenix*, visit the Extensions panel in Tools, Options and *disable all of your extensions*. If you cannot disable extensions, you must *create a new profile* before upgrading to Firefox 0.8. If you do not do this, your browser may not work, and you may receive messages like "Cannot create XBL Binding for Browser" or "Cannot create Browser Instance". You must now look for newer versions of your extensions that are described explicitly as being /compatible with Firefox 0.8/."