Rated 2 out of 5 stars

It is lacking one key feature that will make or brake it for me :
- synchronizing so I do not loose my feeds and I can read on from any computer anywhere.

Without it not much appeal.

This review is for a previous version of the add-on ( 

It might be useful for you: the third tip from the wiki page http://newsfox.mozdev.org/drupal/content/usage-tips

"When you choose the location of the NewsFox directory (Main Options/General tab), you can choose a location on a flash drive and take your NewsFox directory with you. You can also use the same directory for two copies of NewsFox, for example if you have a dual-boot system."