I also had this problem, but managed to fix it with the help of an add-on. If you're in the UK, the solution can be found here: [http://www.piranha-internet.co.uk/blog/firefox-5-search-box-defaulting-to-google-com-%E2%80%93-how-to-fix/ Piranha Internet Firefox Fix]

You can add search engines to the Search Bar from this page: http://mycroft.mozdev.org/ After typing google.co.uk in the search box on that page you see: http://mycroft.mozdev.org/search-engines.html?name=google.co.uk *looks as though #20, second item on the line (google.co.uk) might be what you want. To manage the items in the Search Bar, see: http://support.mozilla.com/en-US/kb/Search+bar '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.''' --------------------------- Not related to your question, but... You need to update some plug-ins: *Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/ *Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.com/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox] *Shockwave Flash (Adobe Flash or Flash): [https://support.mozilla.com/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox] *Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]