Search Result Previews doesn't collect any data.
User preferences (options page data) are stored only locally and are accessible only by extension itself.
All images are served from my server (using VPS provider Contabo) in Germany:
https://srp.fastaddons.com/
Sever cost quite high, so your support is very welcomed!
https://ko-fi.com/fastaddons
There is no tracking of any kind.
No personal information is transferred.
Data are NOT shared with any 3rd party.