I just updated MSG plus, and now as I search stuff by just typing to Firefox's sitebar I just get this MSGplus-"search engine" screen, instead of Google.
How can I make it so, that it's Google, like before?
In the address bar of firefox type in about:config
Enter the configuration (if it gives you a warning)
Search for keyword.URL
Alter the string to read
http://www.google.fi/search?source=ig&hl=fi&rlz=1G1GGLQ_FIFI260&=&aq=f&aqi=&aql=&oq=&gs_rfai=&q=
Other than that it appears that you installed the Messenger Plus! Live Sponsor application. In your Add/Remove Programs (Programs and Features in Windows Vista and higher) if you chose to uninstall Messenger Plus! Live you will be asked to uninstall Plus! or just the sponsor. Choose to uninstall the sponsor.