Add extension compatibility to Opera GX

[ShiromiTsukasa]

Is your feature request related to a problem? Please describe.
Not a problem or anything, I just would like to use this extension with Opera GX. I primarily use GX for pretty much everything so I thought it would be very cool if I had the prebuilt anime themes too (particularly because I have no idea what color goes where).

Describe the solution you'd like
A simple extension load just like all the other ones like Chrome.

Describe alternatives you've considered
I don't really have any idea on how to load the extensions or somehow do CSS magic on the browser, I'm not that at that level yet, sorry.

[Unthrottled]

Yeah, when I get time I'll look into it. Looks like it is chrome based because you can go to chrome://extensions and add extensions that way. However, It appears opera has different extension support, because the theme & newTab extensions don't work.

[PixelHir]

Opera GX has their own system for themes and theme store

Unfortunately it's basically limited to only setting a background image, that's it.
Contents of Opera GX theme: