I've just installed Ghostery 5.4.10 on Opera 37.0.2178.32 (current stable channel).
I turn the browser off and on again and the verification mechanism in my browser doesn't indicate the extension's code is different than the extension's author meant to be on the system.
What you can do is to go to the extension's code folder (which is [browser_profile]/Extensions/bbkekonodcdmedgffkkbgmnnekbainbg) and monitor the changes to the filesystem there (browser's profile folder is shown on "About Opera" page). It will look differently depending on what OS you're using.
Ideally I'd monitor this folder before the extension is even installed. Then the 1st actor who makes changes to this folder should be a browser (installing it). Then the '_metadata' folder should appear with slight delay (this is browser too).
Any later modifications to the extension's source code is a suspicious action.
It might not be a virus, it might be some 3rd party program you've installed doing something. In that case look for an option to leave the browser's profile folder untouched by this software.
Here is a little preview with folders, it's already working with all drag and drop:
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But I still have to know if people prefer just classical tabs stacking without folders.
The difference is that when I go with folders I don't want to go with tabs children route, just plain tabs and folders like in bookmarks.
I know that, Of course I know that - (Opera is my Default Browser more than 3 years, I know how it works. And I Love It !!!) But I'm only asking why after installation we can't customize or rearrange our extensions / add-ons.
I know that at this point it can't be done immediately, and they are arranged as they are installed.
But I just say and I wonder why not to work a little bit on this matter in the Developer Sector or Developer Center by Opera Team, because it would be just great if we all can arrange and reorder them after installation - by our taste so we all can do the fastest, easiest and most efficient way to work with them.