Fireflies effect

[torsteingrindvik]

I feel like I've seen this in games.
When a player moves about in lush, humid, swampy areas, I feel like a typical thing we see in the foreground is fireflies.

Just a bloomy dot buzzing about in the foreground.

Not quite sure how this can be implemented.
There should likely be a parallax effect as well- the fireflies are placed in the foreground, and as such should move proportionally to a player (but in the opposite direction and by a larger distance, I think).

[torsteingrindvik]

https://www.shadertoy.com/view/ldB3zc

Was looking at Voronoi and I noticed the bottom right one.. with some tweaking perhaps that could be a simple fireflies effect?