ah, after a little more digging, it seems that following these instructions: https://forum.manjaro.org/t/howto-enable-tab-switching-in- firefox-using-mouse-wheel/39954 for mouse wheel based tab switching is the cause of the problem.
-- 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/1820413 Title: Firefox 66 can't open new tab Status in firefox package in Ubuntu: Incomplete Bug description: With the disco upgrade to firefox 66, I can't open new tabs, and the browser doesn't cleanly exit on closing windows. Disabling all extensions does not fix, downgrading to firefox 65 does. Safe mode also appears to fix, but weird that disabling extensions doesn't? ProblemType: Bug DistroRelease: Ubuntu 19.04 Package: firefox 66.0+build3-0ubuntu1 ProcVersionSignature: Ubuntu 5.0.0-7.8-generic 5.0.0 Uname: Linux 5.0.0-7-generic x86_64 AddonCompatCheckDisabled: False ApportVersion: 2.20.10-0ubuntu23 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: jbarnett 2363 F.... pulseaudio BuildID: 20190315094614 Channel: Unavailable CurrentDesktop: GNOME Date: Sat Mar 16 10:09:11 2019 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 2018-09-26 (171 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) IpRoute: default via 172.20.0.1 dev wlp2s0 proto dhcp metric 600 169.254.0.0/16 dev wlp2s0 scope link metric 1000 172.20.0.0/20 dev wlp2s0 proto kernel scope link src 172.20.1.179 metric 600 Locales: extensions.sqlite corrupt or missing Plugins: Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so (adobe-flashplugin) PrefSources: /usr/lib/firefox/defaults/pref/all-ubuntu-gnome.js prefs.js Profiles: Profile0 (Default) - LastVersion=66.0/20190315094614 (In use) RelatedPackageVersions: adobe-flashplugin 1:20190312.1-0ubuntu1 RunningIncompatibleAddons: False SourcePackage: firefox Themes: extensions.sqlite corrupt or missing UpgradeStatus: Upgraded to disco on 2019-03-11 (4 days ago) dmi.bios.date: 10/10/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.2.0 dmi.board.name: 0N338G dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.2.0:bd10/10/2018:svnDellInc.:pnXPS159575:pvr:rvnDellInc.:rn0N338G:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: XPS dmi.product.name: XPS 15 9575 dmi.product.sku: 080D dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1820413/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp