Hi again @Takuya , sorry for late response, SO! for the mouse cursor problem just go to :
System Settings > Appearance > Cursors
as shown in the Image :
In below you will see 36 is my cursor size , just chose one you want and it will be fixed .
Now for FireDragon you have to add to /etc/environment a line reading
by going into the terminal and type or just copy it :
sudo nano /etc/environment
you will be asked to enter password so do it , and then you will see text and stuff ,
look like this :
just copy this command :
MOZ_ENABLE_WAYLAND=1
and paste it anywhere using Cntrl + Shift + V and then click both Cntrl + x to exit , you will see down below a confirmation so type Y (it mean yes make changes) and then click Enter
it look like this :
Then update your system using sudo garuda-update , after finishing the update , reboot ,and then CONGRATS !!! issue will be fixed . Ask anything you need you are in the best community .