7859. Firefox seems to have problems around 8000 (or maybe it's just me?), so don't go there :). If you do, and Firefox crashes at startup, you might need to

7859. Firefox seems to have problems around 8000 (or maybe it's just me?), so don't go there :). If you do, and Firefox crashes at startup, you might need to delete (or better: rename) some files under .mozilla/firefox/<profile>/: .mozilla/firefox/<profile>/sessionstore-backups/recovery.jsonlz4 .mozilla/firefox/<profile>/sessionstore-backups/recovery.baklz4 .mozilla/firefox/<profile>/sessionstore.jsonlz4 You'll obviously lose the tabs opened since the last start. You can have a backup with Tab Session Manager (for Chrome too): https://addons.mozilla.org/en-US/firefox/addon/tab-session-manager/ https://addons.mozilla.org/en-US/firefox/addon/tab-session-m... https://github.com/sienori/Tab-Session-Manager/releases https://github.com/sienori/Tab-Session-Manager/releases