"Caret Browsing" is a feature of Firefox which allows you to navigate a page just like a document in MS Word or any other word processing application. You can move the cursor between lines using arrow keys and can select the text or click on any link using your keyboard.
This feature can be turn on using "F7" key. When you press "F7" key, Firefox shows following dialog box:

Click on "Yes" and Caret Browsing will be turned On.
If you want to turn it off, then press "F7" again and click on "No" button.
This article was posted by VG in following section: Mozilla Firefox, Troubleshooting.
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TorMenT
thanks.useful for me.
LiNKiNbOi
I was searching the web for a solution and found nothing.Until,i figured a way out myself.I think this would be a better solution.
STEPS:
1.Enter About:config(or click HERE) in the address bar and press ENTER
2.In the Filter box that appears,type caret
3.Right-Click on accessibility.browsewithcaret
&
Choose toggle and make the value false
4.Right-Click on accessibility.warn_on_browsewithcaret
&
Choose toggle and make the value false
5.Restart your Firefox Browser.
LiNKiNbOi
Oh! I forgot to mention,in many cases the solution posted by the Editor here has been found not to work.If yours is one of them, try my solution.
VG
^^ that solution has already been posted in following tutorial: :)
http://www.askvg.com/how-to-restore-caret-browsing-confirmation-prompt-in-mozilla-firefox/
Dustin
Thanks for the help. I had to turn all the options including one for shortcut to false