To revert to Google as your preferred search engine, please do the following.

• In the location bar, type about:config and hit Enter.
  
  
• In the filter at the top, type: keyword.URL
  
  
• Double click it and remove whatever's in there and replace it with http://www.google.com/search?q=
  
  

The URL to add in "keyword.URL" becomes a link in this post, so right click it and choose "Copy Link Location" to copy it to the Windows clipboard. Then hit CTRL+V to paste it. Saves you having to type the whole thing.

To reset your home page, do the following.

• Go to the site you want to set as your homepage.
  
  
• Click the orange Firefox button and go to Options | Options | General.
  
  
• Make sure it says "Show My Homepage" in the first dropdown menu.
  
  
• Click the button called "Use Current Pages" to set the homepage to the one you have on the screen.
  
  

After you complete the above steps, install this add-on to prevent another search engine from modifying your preferences: https://addons.mozilla.org/en-US/firefox/addon/browserprotect/

Thanks, but this does not work, I mesh has taken over mozilla, google chrome & Internet explorer. I need to get rid of i mesh. Would deleting firefox and starting again be the answer?

Try using instructions on these sites: http://www.hmc.edu/cis/doc/how-to/network/sharing/remove_imesh.shtml

http://www.spyany.com/program/article_spw_rm_IMesh.html

Also, download the free version of Malwarebytes from http://www.malwarebytes.org/products/malwarebytes_free and run a full system scan.

if you have firefox, in the browser, go to the top left hand corner to the firefox tab and go to help. then just click 'restart with all add-ons disabled'. and click everything. worked for me.