Taken from https://github.com/j74/Jitter-GLSL-Shaders/blob/master/Jitter/Shaders/Collection/0159-tr.edgeblend.jxs with added controls and some minor changes

Vignette-like edge blending to alpha,
with separate settings for each side of the image

– Invert
– Amount
– Left
– Bottom
– Right
– Top

donations are very welcome to support converting shaders to freeframe plugins.
next ffgl plugin conversion will be made publicly available when 200€ have been reached

no free download :(