Answer to question found at https://www.reddit.com/r/OperaGX/comments/13gfh77/mods_file_location/

@mithilesh1 I don't know what it is. If it's just a mod, you should be able to install just the mod. If that's an special edition of Opera GX, you probably will have to install it.

@linkvos It seems that you can download it from inside Opera GX. Check GX Corner.

@blindgold I'm having the same issue but my opera is also crashing whenever I try to disable one of the functions. Web modding and shaders I can disable and reenable just fine but trying to disable the others always crash my browser and the only way to disable them is to disable the entire mod and reenable the parts I want active.

@edissonarantes Mods are available only in Opera GX, are you using Opera GX?

@rex81x How it's related to Aria?

try finding them under add ons.
one of the mods i downloaded was moved there for some reason and disappeared from my list of mods.

@burnout426 Oh, thanks.

@demona1 There's an On/Off button at the top of the page. Turn it on.

@venomandri
I think I know what this "bug" is.
It's the: "dynamic background music" feature but you can't turn it off. (I searched the whole settings multiple times) so is there a way to turn this feature off?
(Yes, if you make a mod which is using this feature everything is fine but for me personally i'd like to turn this feature off) (Sorry for my bad english... i'm not a native english speaker)

honestly, yeah, a preset feature would be great. 😃

ive had the same issue but my hdd died with working mods and now the mods do not show up in the mod page but they worked fine on my previous opera GX and now there's no way to re install them would be good if when you logged in with your account it saved your mod list to for easy installation of the mods you used