GLSL Shaders Mod has probably not seen the light of day since 1.8, and now pairing optifine with forge is enough to allow shaders into your world. Though it seems other people want you to think the opposite...
An adware program known as Premier Opinion is around attempting to get onto your computer by making you think that it is the GLSL shaders mod. Adware programs can display pop-ups that you will not want, sometimes uncloseable. The Premier Opinion program, by itself, makes you think that it is a program for taking surveys, possibly promising rewards, I'm not sure. But instead it is adware- displaying popups and advertisements on your web browser without you wanting them.
Premier opinion is packaged with other things aswell. One is a rouge antivirus (a fake antivirus thats just plain annoying) and some other things aswell, I have no idea. All I can say is, do NOT install GLSL shaders mod. You don't need it. Its useless.
Thank you for reading and stay safe.
