Any Firefox extensions that track how long I stay on a web page?

I want to analyze my web surfing habits, and could use something to monitor how long I stay on a page with seconds precision.

Anything like this?

Solution 1:

Mee timer-2.0-3.0,comes with a patch to work above ff 3.1+
The Mee timer will lists each webpage and how long you have visited it, provides logs and does not appear to share info. with outside sites.
'Mee timer 2.0-3.0'-mozilla add ons-the download and patch instructions are on this page.The patch [below the review label.] has readable instructions, but could do with some more detail [at least for my needs]-Sorry i nave not been able to get the test to work but that could be me and not the patch.
If you wish to give the patch a go mee timer could meet your needs.
https://addons.mozilla.org/af/firefox/addon/5168/

Solution 2:

LeechBlock is mainly for blocking sites, but it also has statistics about site usage.