When searching for a specific web site with Google, Firefox redirects to unwanted web sites. These web sites are usual "junk" web sites that have nothing to do with the search we are conducting. We have the latest version of Mozilla and have tried everything to prevent unwanted web sites from displaying. For example, if I enter "Monster.com" in the Google search form, the Firefox redirects to "nfeed.com". Several other web pages will also try to be displayed and eventually Firefox crashes. We have un-installed Firefox and then did a re-install several times now. We also have the latest Internet Explorer but we do not encounter these redirect issues when using IE.
Do a malware check with a few malware scan programs.
You need to use all programs because each detects different malware.
Make sure that you update each program to get the latest version of the database.