Whonix as a development design decision does not modify settings “inside” Tor Browser.
This was previously attempted and I consider the approach failed:
add Tor Browser first startup popup to ask whether security slider should be set to safest
Tor Browser by The Tor Project does not provide a stable API / environment variable or documentation on how to enable blocking of all scripts upon start of Tor Browser. Neither a ticket against Tor Project exists. And I doubt a ticket would result in progress as other ticket such as
- wipe all mentions of netflix, paypal, youtube, ... from noscript in Tor Browser (#31798) · Issues · The Tor Project / Applications / Tor Browser · GitLab or
- Tor Browser 11.0.4-11.0.6 phoning home (#40788) · Issues · The Tor Project / Applications / Tor Browser · GitLab
are unfixed for a long time. So for this to happen, someone would have to submit a pull request to Tor Browser.
Related Whonix Tor Browser Essentials documentation: