Open up about:config and search for 'keyword' then set 'keyword.URL' to

google.be/search?q=

Also, you can add a custom search for google.be using this technique:

https://support.mozilla.org/en-US/kb/how-search-from-address-bar

Hope it helps.

Do a malware check with some malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.

Make sure that you update each program to get the latest version of their databases before doing a scan.

• Malwarebytes' Anti-Malware:
  http://www.malwarebytes.org/mbam.php
• SuperAntispyware:
  http://www.superantispyware.com/
• Microsoft Safety Scanner:
  http://www.microsoft.com/security/scanner/en-us/default.aspx
• Windows Defender: Home Page:
  http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
• Spybot Search & Destroy:
  http://www.safer-networking.org/en/index.html
• Kasperky Free Security Scan:
  http://www.kaspersky.com/security-scan

You can also do a check for a rootkit infection with TDSSKiller.

• http://support.kaspersky.com/viruses/solutions?qid=208280684

See also:

• "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

Thanks for the help.

I did the keyword change as you suggested. In the web-search box, the search seems OK (found one web-adress with the search-term in it; one only, is that OK?) In the google box, the problme is unchanged.

Lieven

Take a look at this add-on so you can add any Search engine you want to your search bar:

https://addons.mozilla.org/en-US/firefox/addon/add-to-search-bar/