9 years
Dots next to username
I made a little note in the Guide to FF about this. 
The total of likes on all your photos, videos, stories/etc are counted together in the karma meter. All the drops are filled up at 300 likes total but the number will still keep going up, just hover your cursor over the meter to see.
I checked yours since you said all of your drops are full, and it says you've got 321 likes at the time of writing this.
The droplets on people's profiles are a Karma Meter for them. 1 purple drop = 50 likes on their content. Hover your cursor over the drops to see exactly how much karma they have.
The total of likes on all your photos, videos, stories/etc are counted together in the karma meter. All the drops are filled up at 300 likes total but the number will still keep going up, just hover your cursor over the meter to see.
I checked yours since you said all of your drops are full, and it says you've got 321 likes at the time of writing this.
9 years