The extensions by default do not collect nor send any personal information to my servers unless you explicitly state your consent.
With your consent, the extension may collect anonymised analytics data and if it has any cloud sync features, login details and settings.
The anonymised analytics information is used for just that, analytics of extension usage
The cloud sync related information is used to provide you with cloud synchronisation features
The anonymised analytics information is stored in json files behind a login lock (so only I have access to it)
The cloud sync information is stored in a database encrypted with your password. The password itself is hashed using bcrypt.
No.
On OVH servers in France or Poland.