This add-on allows you to track the sites that you have been to and also lets you see if this is the first time you have visited. You can also "tag" or "mark" the domain or page for future reference.
Here is an example of how to use it. If you are researching a topic and visit many websites/forums this add-on will illuminate if one or more of the conditions have been met.
First time you have visited this site. N=New
You have previously visited this site/domain and this page before. D&P=Domain & Page
You have previously visited this site/domain before but you have never visited this particular page before. D=Domain
You have visited this page and have left a comment. Click the P icon to "Mark" it.
The add-on creates and saves to a sqlite file for portability. We recommend changing the default DB location.