I think one of the most frustrating issues I run into with Opera GX is when I search through the mods and see a cool feature I want to try out, like a cool cursor, but when I install it, it replaces all my settings with that mod. Then, when you try to remove all the changes it made, it doesn't go back to your own settings, so you have to spend like 30 minutes fixing the problem. I tend to avoid downloading large mods for this reason.

The solution would be not to override all mod settings after installing.