Well it is - and as always with every extention: U can always go through the source code. Tip: Search all files containing http <--- as if the ext sends any of your data it will be to an url.
I have checked every extensions source that I've DL'ed either from Addons here or from Chrome. Only few has had tracking.
If there's someone to continue to maintain it - he/she needs same info that you have/need if you would update it to Addons. On other stores sometimes people transfer projects to one another.
I would want to have option in setting to either see notifications on desktop/action center OR inside the browser. I would much better prefer inside browser. Now I don't use notifications with Opera at all.
There was such at least.. It seems to have disappeared. I'm on dark theme so could that as well. Pages such as bookmarks still lack darkness, it would uplift the feature.
Yeah and send them to folders and such - on the speed dial. surely though speed dial (or start page (both seem to be official names)) could be somewhat more interactive, be more responsive.