The tab session data records a limited number of tabs. The limit imposed relates to the total size of the tab session data and is approximately 70-80 tabs. Once this limit has been exceeded, tab session data is maintained only in the web tier and is no longer written to the database.
Restoration of the tab session when the browser is refreshed is not affected. However, if a user logs out with more tabs open than can be recorded for a session, only the state of the tabs at the time the limit was first exceeded will be restored.
Closing tabs will reduce the size of the tab session data and writing to the database will then resume as normal.