have you set firefox to clear some data on shut-down (history, cache)? it might have become to big to be purged within that 60 seconds after closing the app... you could try if manually deleting the unwanted entries (ctrl+shift+del) during a session improves things.

Thank you for your response. Firefox is not set to clear history or cache when it exits.

Signature:

• Firefox 62.0 Crash Report [@ AsyncShutdownTimeout | Places Clients shutdown | sanitize.js: Sanitize on shutdown ]

Is there any other data cleared via "Clear history when Firefox closes" when you close Firefox?

Hi, we ask that as there is no information : Signature AsyncShutdownTimeout | Places Clients shutdown | sanitize.js: Sanitize on shutdown Something is cleaning out all the data that would let us know more of the issue.

Try please to go to the 3 Bar Menu --> Help --> Troubleshooting Information --> Down to the very bottom all most to Places Database and click on Verify Integrity

Here's what Verify Integrity says: > Task: checkIntegrity + The places.sqlite database is sane + The favicons.sqlite database is sane > Task: invalidateCaches + The caches have been invalidated > Task: checkCoherence + The database is coherent > Task: expire + Database cleaned up > Task: originFrecencyStats + Recalculated origin frecency stats > Task: vacuum + Initial database size is 61440KiB + The database has been vacuumed + Final database size is 61440KiB > Task: stats + Places.sqlite size is 61440KiB + Favicons.sqlite size is 6656KiB + pragma_user_version is 52 + pragma_page_size is 4096 + pragma_cache_size is -2048 + pragma_journal_mode is wal + pragma_synchronous is 1 + History can store a maximum of 149797 unique pages + Table moz_bookmarks has 938 records + Table moz_keywords has 5 records + Table sqlite_sequence has 1 records + Table moz_annos has 970 records + Table moz_anno_attributes has 7 records + Table moz_items_annos has 160 records + Table moz_places has 127267 records + Table moz_historyvisits has 209540 records + Table moz_inputhistory has 2 records + Table sqlite_stat1 has 19 records + Table moz_hosts has 0 records + Table moz_bookmarks_deleted has 0 records + Table moz_meta has 8 records + Table moz_origins has 10695 records + Index sqlite_autoindex_moz_keywords_1 + Index sqlite_autoindex_moz_anno_attributes_1 + Index sqlite_autoindex_moz_inputhistory_1 + Index sqlite_autoindex_moz_hosts_1 + Index sqlite_autoindex_moz_bookmarks_deleted_1 + Index sqlite_autoindex_moz_origins_1 + Index moz_bookmarks_itemindex + Index moz_bookmarks_parentindex + Index moz_bookmarks_itemlastmodifiedindex + Index moz_places_hostindex + Index moz_places_visitcount + Index moz_places_frecencyindex + Index moz_historyvisits_placedateindex + Index moz_historyvisits_fromindex + Index moz_historyvisits_dateindex + Index moz_places_lastvisitdateindex + Index moz_places_url_hashindex + Index moz_annos_placeattributeindex + Index moz_items_annos_itemattributeindex + Index moz_bookmarks_guid_uniqueindex + Index moz_places_guid_uniqueindex + Index moz_keywords_placepostdata_uniqueindex + Index moz_bookmarks_dateaddedindex + Index moz_places_originidindex > Task: _refreshUI

Does this suggest anything? Thanks!

Try to clear the cache; I have had something like this when cache volume hit max.