My last five crash reports, one of them while running in safe mode: bp-bc6f7dc8-4316-4c6e-93b2-6ac440181202 bp-e64188af-abf2-487c-8c45-9e77f0181202 bp-651d90db-c43d-4635-95d8-1def00181202 bp-ddfa4676-afcc-4d7a-8323-1e0660181128 bp-046798d1-36d0-4002-b23f-8a3760181128

Thank you for the report IDs. All five have the crash signature

[@ AsyncShutdownTimeout | Places Clients shutdown | sanitize.js: Sanitize on shutdown ]

Usually, Sanitize on shutdown references the optional "Clear history when Firefox closes" feature, and Places references the database file that stores history and bookmarks. So if you have set Firefox to clear history when it closes, that might be where Firefox is running into trouble finishing the job before running out of time and being intentionally crashed.

Does that sound like something you might have set up? This article describes where that is on the Options page:

Delete browsing, search and download history on Firefox -- "How do I make Firefox clear my history automatically?" section

Note: I'm not recommending it, just describing where it's set.

[v57+] Places Maintenance is built into Firefox.

Type about:support<enter> in the address bar.

You will find Places Database near the bottom. Press the Verify Integrity button.

When done, copy and post the results here.

Guys, thanks for the ultrafast replies! I did not set Firefox to clear my history automatically; maybe the opposite is the problem? Maybe my history is too long? Verify Integrity results: > 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 30720KiB + The database has been vacuumed + Final database size is 30720KiB > Task: stats + Places.sqlite size is 30720KiB + Favicons.sqlite size is 20928KiB + pragma_user_version is 52 + pragma_page_size is 32768 + pragma_cache_size is -2048 + pragma_journal_mode is wal + pragma_synchronous is 1 + History can store a maximum of 42472 unique pages + Table moz_places has 50176 records + Table moz_historyvisits has 93122 records + Table moz_inputhistory has 0 records + Table moz_hosts has 0 records + Table moz_bookmarks has 1826 records + Table moz_keywords has 0 records + Table sqlite_sequence has 0 records + Table moz_anno_attributes has 9 records + Table moz_annos has 2984 records + Table moz_items_annos has 1186 records + Table sqlite_stat1 has 16 records + Table moz_bookmarks_deleted has 5 records + Table moz_meta has 4 records + Table moz_origins has 5519 records + Index sqlite_autoindex_moz_inputhistory_1 + Index sqlite_autoindex_moz_hosts_1 + Index sqlite_autoindex_moz_keywords_1 + Index sqlite_autoindex_moz_anno_attributes_1 + Index sqlite_autoindex_moz_bookmarks_deleted_1 + Index sqlite_autoindex_moz_origins_1 + Index moz_places_url_hashindex + Index moz_places_hostindex + Index moz_places_visitcount + Index moz_places_frecencyindex + Index moz_places_lastvisitdateindex + Index moz_places_guid_uniqueindex + Index moz_historyvisits_placedateindex + Index moz_historyvisits_fromindex + Index moz_historyvisits_dateindex + Index moz_bookmarks_itemindex + Index moz_bookmarks_parentindex + Index moz_bookmarks_itemlastmodifiedindex + Index moz_bookmarks_guid_uniqueindex + Index moz_keywords_placepostdata_uniqueindex + Index moz_annos_placeattributeindex + Index moz_items_annos_itemattributeindex + Index moz_bookmarks_dateaddedindex + Index moz_places_originidindex > Task: _refreshUI

Hello, any ideas on the above? I tried to delete some of my history, and when I try to delete a few hundred entries at once, an error message about a not-responding script appears, for instance: Skript: chrome://browser/content/places/treeView.js:1469

Here is an idea. If you don't care about losing your history;

Type about:support<enter> in the address bar.

Under the page logo on the left side, you will see Application Basics. Under this find Profile Folder. To its right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Locate the places.sqlite file. Then rename it by adding .old to it. Restart Firefox.

This will cause the browser to recreate the file using bookmark backups.