A set of 6 special fields allows you to tag your entries in order to rate read papers, indicate their relevance to your work, indicate that their quality has been assured, etc. Internally, each special field is stored in a separate BibTeX field.
This feature has to be activated in Options → Preferences → Entry Table by checking the item
Enable special fields.
The status of each special field can be displayed in the table of entries as dedicated columns.
Like any other field, the special field columns can be turned on and off individually in Options → Preferences → Entry Table.
You can see the value of a special field by:
clicking in the column.
a right-click on an entry.
the menu Edit.
An entry can be marked as relevant: a black-and-white star is displayed (in the first column of the image below).
The read status can be set to "No" (no symbol in the column), to "Skimmed" (an orange eye), or to "read" (a green eye).
JabRef offers a rank from one to five yellow stars to rate your papers. By default, no rank is given.
An entry may be marked as quality assured (fourth column in the image below). For example, you can mark the entries for which a thorough check of the field contents has been done.
You can set the priority of an entry from low (red flag) to high (green flag). For example, you can use it to prioritize unread papers.
This field allows to state is the paper has been printed or not (sixth column in the image above).