Firefox appearance and VLC not playing

Hello,
I just recently installed Manjaro KDE and have two issues.

  1. When I switch to a darker theme on firefox, I can barely see the minimise, maximise, close button in the top right corner (see image)

  2. When I try to play a stream via streamlink twitch and want to use vlc, it does not play the video (see image). If I use the mpv player, it works as intended. However, I would like to use vlc here.

System:
  Kernel: 5.10.34-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.10-x86_64 
  root=UUID=5e254acd-9b7d-4b09-8a47-5c10fe0df1cb rw quiet apparmor=1 
  security=apparmor resume=UUID=d7090368-3e15-4428-969b-1ae0f41039eb 
  udev.log_priority=3 
  Desktop: KDE Plasma 5.21.4 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM 
  Distro: Manjaro Linux base: Arch Linux 
Machine:
  Type: Laptop System: Schenker product: SCHENKER VIA 15 Pro v: Standard 
  serial: <filter> 
  Mobo: Schenker model: PF5NU1G v: Standard serial: <filter> 
  UEFI: American Megatrends v: N.1.06.A00 date: 09/18/2020 
Battery:
  ID-1: BAT0 charge: 77.7 Wh (87.0%) condition: 89.3/91.6 Wh (97.5%) 
  volts: 12.2 min: 11.6 model: standard type: Li-ion serial: <filter> 
  status: Discharging 
  Device-1: hidpp_battery_0 model: Logitech Wireless Mouse B330/M330/M331 
  serial: <filter> charge: 55% (should be ignored) rechargeable: yes 
  status: Discharging 
Memory:
  RAM: total: 15.12 GiB used: 3.09 GiB (20.4%) 
  RAM Report: permissions: Unable to run dmidecode. Root privileges required. 
CPU:
  Info: 6-Core model: AMD Ryzen 5 4600H with Radeon Graphics bits: 64 
  type: MT MCP arch: Zen 2 family: 17 (23) model-id: 60 (96) stepping: 1 
  microcode: 8600103 cache: L2: 3 MiB bogomips: 71868 
  Speed: 1397 MHz min/max: 1400/3000 MHz boost: enabled Core speeds (MHz): 
  1: 1397 2: 1397 3: 1397 4: 1397 5: 1397 6: 1397 7: 1397 8: 1397 9: 1397 
  10: 1396 11: 1397 12: 1397 
  Flags: 3dnowprefetch abm adx aes aperfmperf apic arat avic avx avx2 bmi1 
  bmi2 bpext cat_l3 cdp_l3 clflush clflushopt clwb clzero cmov cmp_legacy 
  constant_tsc cpb cpuid cqm cqm_llc cqm_mbm_local cqm_mbm_total cqm_occup_llc 
  cr8_legacy cx16 cx8 de decodeassists extapic extd_apicid f16c flushbyasid 
  fma fpu fsgsbase fxsr fxsr_opt ht hw_pstate ibpb ibrs ibs irperf lahf_lm 
  lbrv lm mba mca mce misalignsse mmx mmxext monitor movbe msr mtrr mwaitx 
  nonstop_tsc nopl npt nrip_save nx osvw overflow_recov pae pat pausefilter 
  pclmulqdq pdpe1gb perfctr_core perfctr_llc perfctr_nb pfthreshold pge pni 
  popcnt pse pse36 rdpid rdpru rdrand rdseed rdt_a rdtscp rep_good sep sha_ni 
  skinit smap smca smep ssbd sse sse2 sse4_1 sse4_2 sse4a ssse3 stibp succor 
  svm svm_lock syscall tce topoext tsc tsc_scale umip v_vmsave_vmload vgif 
  vmcb_clean vme vmmcall wbnoinvd wdt xgetbv1 xsave xsavec xsaveerptr xsaveopt 
  xsaves 
  Vulnerabilities: Type: itlb_multihit status: Not affected 
  Type: l1tf status: Not affected 
  Type: mds status: Not affected 
  Type: meltdown status: Not affected 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 mitigation: Full AMD retpoline, IBPB: conditional, IBRS_FW, 
  STIBP: conditional, RSB filling 
  Type: srbds status: Not affected 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: AMD Renoir vendor: Tongfang Hongkong Limited driver: amdgpu 
  v: kernel bus-ID: 04:00.0 chip-ID: 1002:1636 class-ID: 0300 
  Device-2: Chicony HD Webcam type: USB driver: uvcvideo bus-ID: 1-3:3 
  chip-ID: 04f2:b68b class-ID: 0e02 serial: <filter> 
  Display: x11 server: X.Org 1.20.11 compositor: kwin_x11 driver: 
  loaded: amdgpu,ati unloaded: modesetting alternate: fbdev,vesa 
  display-ID: :0 screens: 1 
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2") 
  s-diag: 582mm (22.9") 
  Monitor-1: eDP res: 1920x1080 hz: 60 dpi: 142 size: 344x194mm (13.5x7.6") 
  diag: 395mm (15.5") 
  OpenGL: renderer: AMD RENOIR (DRM 3.40.0 5.10.34-1-MANJARO LLVM 11.1.0) 
  v: 4.6 Mesa 21.0.3 direct render: Yes 
Audio:
  Device-1: AMD vendor: Tongfang Hongkong Limited driver: snd_hda_intel 
  v: kernel bus-ID: 04:00.1 chip-ID: 1002:1637 class-ID: 0403 
  Device-2: AMD Raven/Raven2/FireFlight/Renoir Audio Processor 
  vendor: Tongfang Hongkong Limited driver: N/A 
  alternate: snd_pci_acp3x, snd_rn_pci_acp3x bus-ID: 04:00.5 
  chip-ID: 1022:15e2 class-ID: 0480 
  Device-3: AMD Family 17h HD Audio vendor: Tongfang Hongkong Limited 
  driver: snd_hda_intel v: kernel bus-ID: 04:00.6 chip-ID: 1022:15e3 
  class-ID: 0403 
  Sound Server-1: ALSA v: k5.10.34-1-MANJARO running: yes 
  Sound Server-2: JACK v: 0.125.0 running: no 
  Sound Server-3: PulseAudio v: 14.2 running: yes 
  Sound Server-4: PipeWire v: 0.3.26 running: yes 
Network:
  Device-1: Intel Wi-Fi 6 AX200 vendor: Rivet Networks driver: iwlwifi 
  v: kernel bus-ID: 01:00.0 chip-ID: 8086:2723 class-ID: 0280 
  IF: wlp1s0 state: up mac: <filter> 
  IP v4: <filter> type: dynamic noprefixroute scope: global 
  broadcast: <filter> 
  IP v6: <filter> type: dynamic noprefixroute scope: global 
  IP v6: <filter> type: noprefixroute scope: link 
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: Tongfang Hongkong Limited driver: r8169 v: kernel port: f000 
  bus-ID: 02:00.0 chip-ID: 10ec:8168 class-ID: 0200 
  IF: eno1 state: down mac: <filter> 
  WAN IP: <filter> 
Bluetooth:
  Device-1: Intel AX200 Bluetooth type: USB driver: btusb v: 0.8 
  bus-ID: 1-4.4:6 chip-ID: 8087:0029 class-ID: e001 
  Report: rfkill ID: hci0 rfk-id: 4 state: down bt-service: enabled,running 
  rfk-block: hardware: no software: yes address: see --recommends 
Logical:
  Message: No logical block device data found. 
RAID:
  Message: No RAID data found. 
Drives:
  Local Storage: total: 232.89 GiB used: 10.17 GiB (4.4%) 
  SMART Message: Unable to run smartctl. Root privileges required. 
  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Kingston model: SA2000M8250G 
  size: 232.89 GiB block-size: physical: 512 B logical: 512 B speed: 31.6 Gb/s 
  lanes: 4 rotation: SSD serial: <filter> rev: S5Z42105 temp: 26.9 C 
  scheme: GPT 
  Message: No optical or floppy data found. 
Partition:
  ID-1: / raw-size: 215.95 GiB size: 211.5 GiB (97.94%) used: 10.17 GiB (4.8%) 
  fs: ext4 dev: /dev/nvme0n1p2 maj-min: 259:2 label: N/A 
  uuid: 5e254acd-9b7d-4b09-8a47-5c10fe0df1cb 
  ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%) 
  used: 296 KiB (0.1%) fs: vfat dev: /dev/nvme0n1p1 maj-min: 259:1 
  label: NO_LABEL uuid: F332-F5DD 
Swap:
  Kernel: swappiness: 60 (default) cache-pressure: 100 (default) 
  ID-1: swap-1 type: partition size: 16.64 GiB used: 0 KiB (0.0%) priority: -2 
  dev: /dev/nvme0n1p3 maj-min: 259:3 label: N/A 
  uuid: d7090368-3e15-4428-969b-1ae0f41039eb 
Unmounted:
  Message: No unmounted partitions found. 
USB:
  Hub-1: 1-0:1 info: Full speed (or root) Hub ports: 4 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Device-1: 1-2:2 info: Logitech Unifying Receiver type: Mouse,HID 
  driver: logitech-djreceiver,usbhid interfaces: 2 rev: 2.0 speed: 12 Mb/s 
  power: 98mA chip-ID: 046d:c52f class-ID: 0300 
  Device-2: 1-3:3 info: Chicony HD Webcam type: Video driver: uvcvideo 
  interfaces: 4 rev: 2.0 speed: 480 Mb/s power: 500mA chip-ID: 04f2:b68b 
  class-ID: 0e02 serial: <filter> 
  Hub-2: 1-4:4 info: Genesys Logic Hub ports: 4 rev: 2.0 speed: 480 Mb/s 
  power: 100mA chip-ID: 05e3:0608 class-ID: 0900 
  Device-1: 1-4.3:5 info: Realtek RTS5129 Card Reader Controller 
  type: <vendor specific> driver: rtsx_usb,rtsx_usb_ms,rtsx_usb_sdmmc 
  interfaces: 1 rev: 2.0 speed: 480 Mb/s power: 500mA chip-ID: 0bda:0129 
  class-ID: ff00 serial: <filter> 
  Device-2: 1-4.4:6 info: Intel AX200 Bluetooth type: Bluetooth driver: btusb 
  interfaces: 2 rev: 2.0 speed: 12 Mb/s power: 100mA chip-ID: 8087:0029 
  class-ID: e001 
  Hub-3: 2-0:1 info: Full speed (or root) Hub ports: 2 rev: 3.1 speed: 10 Gb/s 
  chip-ID: 1d6b:0003 class-ID: 0900 
  Hub-4: 3-0:1 info: Full speed (or root) Hub ports: 4 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-5: 4-0:1 info: Full speed (or root) Hub ports: 2 rev: 3.1 speed: 10 Gb/s 
  chip-ID: 1d6b:0003 class-ID: 0900 
Sensors:
  System Temperatures: cpu: 36.2 C mobo: 35.0 C gpu: amdgpu temp: 35.0 C 
  Fan Speeds (RPM): N/A 
Info:
  Processes: 267 Uptime: 3h 31m wakeups: 23 Init: systemd v: 247 
  tool: systemctl Compilers: gcc: 10.2.0 Packages: pacman: 1274 lib: 355 
  flatpak: 0 Shell: Bash v: 5.1.4 running-in: konsole inxi: 3.3.04 

I guess the solution is quite simple, but my knowledge is limited :slight_smile:

e// ok, sth with the images didnโ€™t work and links are also not possibleโ€ฆ

:+1: Welcome to Manjaro! :+1:

Please read this:

Which theme exactly and how did you apply the theme (again: exactly)

Exact Link, please? :grin:

:+1: for posting an inxi :+1:

:stuck_out_tongue_winking_eye: