Firefox takes a moment before being reactive after launch

[Coeur Noir]

Description from duplicate bug report:

Hi,

on a freshly installed Ubuntu Budgie 19.10, I've noticed Firefox is kind of slow at start :
⋅ I can launch Firefox but it’s unresponsive for a moment ( no blinking cursor anywhere )
⋅ then cursor eventually appears in address bar but blinking slowly and not usable,
⋅ still, clicking anywhere has no effect, or effect delayed much later,
⋅ a moment later, cursor blinks at its usual pace and Firefox becomes responsive as expected.
The whole process takes 30 seconds to 1 minute and Firefox runs rather ok later on with some slow moments though ( sometimes tabs are slow to react, or any interactions with buttons in FF menu ).

Same behavior in safe-mode ( without any FF addons )

Same without any Budgie applets regarding app-menu ( such as pixel-saver or global-menu applets ).

see also :
⋅ https://discourse.ubuntubudgie.org/t/firefox-in-19-10-is-kind-of-slow-to-start/3265
⋅ https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/813775

=========================================================================

Hi,

sorry for duplicata, I did not know how to add info on the other same bug, see https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1869597

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: firefox 74.0+build3-0ubuntu0.19.10.1
ProcVersionSignature: Ubuntu 5.3.0-45.37-generic 5.3.18
Uname: Linux 5.3.0-45-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu8.8
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: django 6230 F.... pulseaudio
 /dev/snd/controlC1: django 6230 F.... pulseaudio
 /dev/snd/pcmC1D0p: django 6230 F...m pulseaudio
BuildID: 20200309095159
Channel: Unavailable
CurrentDesktop: Budgie:GNOME
Date: Fri Apr 3 02:04:06 2020
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/firefox/omni.ja:greprefs.js:732
DefaultProfileThemes: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
InstallationDate: Installed on 2020-03-22 (11 days ago)
InstallationMedia: Ubuntu-Budgie 19.10 "Eoan Ermine" - Release amd64 (20191017)
IpRoute:
 default via 192.168.1.254 dev enp3s0 proto static metric 100
 169.254.0.0/16 dev enp3s0 scope link metric 1000
 192.168.1.0/24 dev enp3s0 proto kernel scope link src 192.168.1.99 metric 100
Profile0Extensions: extensions.sqlite corrupt or missing
Profile0IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
Profile0Locales: extensions.sqlite corrupt or missing
Profile0PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/firefox/omni.ja:greprefs.js:732
Profile0PrefSources: prefs.js
Profile0Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile1 (Default) - LastVersion=None/None (Out of date)
 Profile0 - LastVersion=74.0/20200309095159 (In use)
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/15/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2103
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Z87-C
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2103:bd08/15/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ87-C:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.family: ASUS MB
dmi.product.name: All Series
dmi.product.sku: All
dmi.product.version: System Version
dmi.sys.vendor: ASUS

[Coeur Noir (coeur-noir)]

On Ubuntu Budgie 19.10, the problem disappears when I do not use global-menu-applet.

On Ubuntu Budgie 20.04, no problem at all, even while using global-menu-applet.

So probably something changed in Firefox Ubuntu package regarding menu ( ? ).

[Olivier Tilloy (osomon)]

Indeed, the Ubuntu patch to enable global menu integration in Firefox was removed in 20.04 (see https://bazaar.launchpad.net/~mozillateam/firefox/firefox.focal/revision/1340).