I have a new install of Mint 21.2 but I'm afraid to sync Firefox from my tablet or phone because of the weird errors that popped up from Firefox on my desktop and this laptop I am writing on. Clean installs are on this laptop and the desktop.
It seems that Firefox's most recent updates messed up a lot of things, such as space issues, even though the old installs had huge space available. Also I lost all my bookmarks in these errors.
I have no errors to forward in this thread, because I wiped both drives in the new installs.

System:
Kernel: 5.15.0-79-generic x86_64 bits: 64 compiler: gcc v: 11.3.0 Desktop: Cinnamon 5.8.4
tk: GTK 3.24.33 wm: muffin dm: LightDM Distro: Linux Mint 21.2 Victoria base: Ubuntu 22.04 jammy
Machine:
Type: Laptop System: LENOVO product: 20ARS06P00 v: ThinkPad T440s serial: <superuser required>
Chassis: type: 10 serial: <superuser required>
Mobo: LENOVO model: 20ARS06P00 serial: <superuser required> UEFI: LENOVO v: GJET99WW (2.49 )
date: 06/05/2018
Battery:
ID-1: BAT0 charge: 15.3 Wh (100.0%) condition: 15.3/23.2 Wh (66.1%) volts: 12.3 min: 11.1
model: SANYO 45N1773 serial: <filter> status: Full
ID-2: BAT1 charge: 41.8 Wh (96.8%) condition: 43.2/47.5 Wh (91.0%) volts: 12.4 min: 10.8
model: SANYO 45N1734 serial: <filter> status: Not charging
Device-1: hid-00:02:76:15:6a:5d-battery model: VGP-BMS33 serial: N/A charge: N/A
status: Discharging
CPU:
Info: dual core model: Intel Core i5-4300U bits: 64 type: MT MCP arch: Haswell rev: 1 cache:
L1: 128 KiB L2: 512 KiB L3: 3 MiB
Speed (MHz): avg: 2124 high: 2399 min/max: 800/2900 cores: 1: 2207 2: 1979 3: 1911 4: 2399
bogomips: 19954
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
Device-1: Intel Haswell-ULT Integrated Graphics vendor: Lenovo driver: i915 v: kernel ports:
active: eDP-1 empty: DP-1, DP-2, HDMI-A-1, HDMI-A-2 bus-ID: 00:02.0 chip-ID: 8086:0a16
Device-2: Chicony Integrated Camera type: USB driver: uvcvideo bus-ID: 2-8:4
chip-ID: 04f2:b39a
Display: x11 server: X.Org v: 1.21.1.4 driver: X: loaded: modesetting unloaded: fbdev,vesa
gpu: i915 display-ID: :0 screens: 1
Screen-1: 0 s-res: 1600x900 s-dpi: 96
Monitor-1: eDP-1 model: AU Optronics res: 1600x900 dpi: 132 diag: 355mm (14")
OpenGL: renderer: Mesa Intel HD Graphics 4400 (HSW GT2) v: 4.6 Mesa 23.0.4-0ubuntu1~22.04.1
direct render: Yes
Audio:
Device-1: Intel Haswell-ULT HD Audio vendor: Lenovo driver: snd_hda_intel v: kernel
bus-ID: 00:03.0 chip-ID: 8086:0a0c
Device-2: Intel 8 Series HD Audio vendor: Lenovo driver: snd_hda_intel v: kernel
bus-ID: 00:1b.0 chip-ID: 8086:9c20
Sound Server-1: ALSA v: k5.15.0-79-generic running: yes
Sound Server-2: PulseAudio v: 15.99.1 running: yes
Sound Server-3: PipeWire v: 0.3.48 running: yes
Network:
Device-1: Intel Ethernet I218-LM vendor: Lenovo ThinkPad X240 driver: e1000e v: kernel
port: 3080 bus-ID: 00:19.0 chip-ID: 8086:155a
IF: enp0s25 state: down mac: <filter>
Device-2: Intel Wireless 7260 driver: iwlwifi v: kernel pcie: speed: 2.5 GT/s lanes: 1
bus-ID: 03:00.0 chip-ID: 8086:08b2
IF: wlp3s0 state: up mac: <filter>
Bluetooth:
Device-1: Intel Bluetooth wireless interface type: USB driver: btusb v: 0.8 bus-ID: 2-7:3
chip-ID: 8087:07dc
Report: hciconfig ID: hci0 rfk-id: 1 state: up address: <filter> bt-v: 2.1 lmp-v: 4.0
sub-v: 500
Drives:
Local Storage: total: 256.17 GiB used: 21.93 GiB (8.6%)
ID-1: /dev/sda vendor: Crucial model: CT275MX300SSD1 size: 256.17 GiB speed: 6.0 Gb/s
serial: <filter>
Partition:
ID-1: / size: 250.6 GiB used: 21.93 GiB (8.7%) fs: ext4 dev: /dev/sda2
ID-2: /boot/efi size: 511 MiB used: 6.1 MiB (1.2%) fs: vfat dev: /dev/sda1
Swap:
ID-1: swap-1 type: file size: 2 GiB used: 1.2 MiB (0.1%) priority: -2 file: /swapfile
Sensors:
System Temperatures: cpu: 47.0 C mobo: N/A
Fan Speeds (RPM): fan-1: 0
Repos:
Packages: apt: 2170
No active apt repos in: /etc/apt/sources.list
Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
1: deb https: //muug.ca/mirror/linuxmint/packages victoria main upstream import backport
2: deb http: //archive.ubuntu.com/ubuntu jammy main restricted universe multiverse
3: deb http: //archive.ubuntu.com/ubuntu jammy-updates main restricted universe multiverse
4: deb http: //archive.ubuntu.com/ubuntu jammy-backports main restricted universe multiverse
5: deb http: //security.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
Active apt repos in: /etc/apt/sources.list.d/spotify.list
1: deb http: //repository.spotify.com stable non-free
Info:
Processes: 260 Uptime: 1h 46m Memory: 11.56 GiB used: 3.29 GiB (28.5%) Init: systemd v: 249
runlevel: 5 Compilers: gcc: 11.4.0 alt: 11/12 Client: Unknown python3.10 client inxi: 3.3.13

Again, not sure why we need to know about your motherboard, sound server, battery or network card for a Firefox problem. You tell us it's Mint 21.2....but don't bother to tell us what version of Firefox (the program you're having trouble with).

And did you read/think about what you posted??? Because if this is a clean installation and you haven't sync'ed anything...how, exactly, do you think your bookmarks and other things would show up?? You post no errors, and actually post the solution yourself. Want your bookmarks? Then *SYNC FIREFOX* from somewhere that has them.