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 Xircal for the solution to remove imesh from Firefox.

Ok guys i had this problem too you need to uninstall a program called mediabar. search for it (start,search) than type mediabar try to delete. if you cant enter the folder and click uninstall.

Hey. I have trouble with I-mesh, i have do all things posted up here to solve (remoove) that toolbar but wont help me. :( Wont change the url, at restart its all the same

I finally got rid of imesh. Had to clean up all the little files it left lying around including uninstalling it Mediabar. Then unistalled Firefox including all memorized info--passwords, etc. What a pain. Then I reinstalled it. No more imesh.

Hate those nasty programs that hang around when you are done with them!