Ok before i go over the content in this small datapack...
DO NOT FEED FIREFLIES TO FROGS
With that out of the way, this pack is my response to Mojang deciding to cut Fireflies from the 1.19 update.

The Firefly
This small two pixel critter can spawn in any form of temperate forest (oak, birch, dark), rivers, and swamps, while not spawning very much through the day, their numbers nearly quadruple when the moon emerges, Fireflies are very fragile and will die to literally almost any form of attack to them.
Fireflies tend to simply float around, randomly lighting themselves up to emit light pulses in the area around it, they tend to avoid going into water as they die if they descend into any form of water. Frogs are the main predator of fireflies and can often be seen usually snacking on random fireflies nearby, whenever a Frog eats a firefly it has a small chance to drop a Froglight of it's respective color, no matter the amount eaten beforehand.

Fireflies have one other feature related to them and it's related to Glass Bottles. Left clicking a firefly with a glass bottle will cause the firefly to be stored within the bottle, one bottle can store up to five fireflies, and finally to release the glowing insects once more you simply right click the ground to bring one of the fireflies out of the bottle. Fireflies released from glass bottles will never despawn from natural means, so you can go ahead and have a bunch of them for some lighting in a room or add them to an enclosed area simply for the ambience they provide, you can essentially put these things wherever you want.

So yeah thats basically the entire pack, i just got a bit petty over Mojang removing them so i decided to do it myself.
Also I'm updating Origins and the Infinity Gauntlet at some point in the summer and early fall so you best be watching