In general, JFS plugin works as a filter applied to pages generated by JIRA. This allows to keep an amount of changes to original JIRA source code as small as possible, thus improving overall stability and maintainability. On the other hand, such an approach requires that every page is processed properly. This can only be guaranteed for plugins that have been explicitly tested for compatibility with JFS.
JFS by default blocks an access for all users to the pages (identified by their URLs), which it does not know how to process. This can result in incorrect behavior of some plugins.
Issue Views & Screens
Secured custom fields are removed both from "current values" sections and from change history. If any change group occurs to be empty after change item removal, it will be also removed.
Issue Create & Edit Screen
Secured fields are removed from issue table with respect of each issue. For example, one can use "Reporter" condition to make some field visible only for issue's reporter.
After (logged in as Administrator):
Security Scheme Settings:
Assigned to Me
Output of gadgets with issue tables is process in the same way as the Issue Navigator.
If there is an active security restriction on a selected field (any of fields for Two Dimensional Stats) for any issue returned by the selected filter - the user will be denied to see the gadget output.
Activity Streams Gadget
Activities with restricted field changes are removed from the stream.
Field Security Settings:
Issue Updated Messages
Restricted field value changes are removed from Issue Updated messages.
Filter subscriptions are processed in the same way as Issue Navigator.