Rated 5 out of 5 stars

FF 15 broke my Session Manager plugin leaving me with a blank session. On the SM forums, the following solution worked for me:

1. Navigate to about:config (enter in URL field)
2. Search for dom.indexedDB.enabled and set to true (switch by double-clicking)
3. Restart FF

This review is for a previous version of the add-on (0.8.1.6.1-signed).