I usually eyeball my rice so I use the finger method which is,
Rinse and drain your rice in a sieve first
Add it to the pot and level it off
Put your index finger on top of the rice and add cold water till it touches your first knuckle
Bring to a boil, reduce heat to low and cover until cooked
You can always buy a rice cooker but I think it’s good to learn how to cook without specific instruments, it also cuts down clutter in the kitchen.
I use firefox but I have to change my useragent string to chrome with an extension to get YouTube working.
Might be worth having a look to see if it fixes your issues