PureBrowser supports collecting telemetry data, and by default uploads such data to Mozilla.
Discussed in detail at Mozilla bugtracker.
Either...
- PureBrowser should be built with telemetry reporting support disabled (by use of configure flag or patch), or
- PureBrowser should be configured to disable telemetry reporting by default, or
- PureOS should include in default install a Mozilla addon to disable telemetry reporting to Mozilla.