As far as I am aware the snap version of Firefox will store settings in a different area to that of the .deb. I wonder if you have some settings in the ~/.mozilla directory owned by a user other than you. If you still have those settings in place you could search for anything owned by another user.
In the past I've found running in the home directory: find \! -user yourusername to have revealed several files owned by root that have stopped various applications from working correctly. Correcting the owner allowed those applications to then function as expected. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1726861 Title: bookmarks & history system not available Status in firefox package in Ubuntu: Incomplete Bug description: I've followed the troubleshooting information suggested in Firefox with no results including multiple reboots. Also uninstalled & reinstalled firefox. Still cannot restore bookmarks or import bookmarks from html. Cannot sync bookmarks using firefox sync. Firefox still reports that the bookmark & history system is not available because some files are in use by another application. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: firefox 56.0+build6-0ubuntu0.16.04.2 ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87 Uname: Linux 4.4.0-97-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia AddonCompatCheckDisabled: False ApportVersion: 2.20.1-0ubuntu2.10 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: brent 2321 F.... pulseaudio /dev/snd/controlC2: brent 2321 F.... pulseaudio /dev/snd/controlC0: brent 2321 F.... pulseaudio BuildID: 20171003101344 Channel: Unavailable CurrentDesktop: GNOME Date: Tue Oct 24 07:49:01 2017 Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) InstallationDate: Installed on 2015-03-09 (959 days ago) InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) IpRoute: default via 192.168.1.1 dev eth0 proto static metric 100 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.203 metric 100 IwConfig: lo no wireless extensions. eth0 no wireless extensions. Locales: extensions.sqlite corrupt or missing MostRecentCrashID: bp-c54702b4-1092-4d28-8224-51ecd1171023 Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so PrefSources: prefs.js ProcEnviron: LANGUAGE=en_US PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash Profiles: Profile0 (Default) - LastVersion=56.0/20171003101344 (In use) RfKill: RunningIncompatibleAddons: False SourcePackage: firefox Themes: extensions.sqlite corrupt or missing UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/03/2011 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1102 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: P7P55 LX dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: Rev X.0x dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1102:bd01/03/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP7P55LX:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1726861/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

