"Tor Launcher uses all expected TBB shared libraries" is fragile

And the Tor Launcher uses all expected TBB shared libraries Command failed: find /usr/lib /lib -name "libnssutil3.so" error code: 1 stderr: find: /lib/live/mount/overlay/var/tmp/systemd-private-9a29e2ac5e134767bdb750c1f0108468-systemd-hostnamed.service-23b1BY/tmp': No such file or directory . is not true. (ExecutionFailedInVM) ./features/support/helpers/vm_helper.rb:442:in rescue in execute_successfully' ./features/support/helpers/vm_helper.rb:439:in execute_successfully' ./features/step_definitions/browser.rb:145:in block in xul_app_shared_lib_check' ./features/step_definitions/browser.rb:140:in each' ./features/step_definitions/browser.rb:140:in xul_app_shared_lib_check' ./features/step_definitions/browser.rb:166:in /^the (.*) uses all expected TBB shared libraries$/' features/tor_bridges.feature:12:in And the Tor Launcher uses all expected TBB shared libraries'

Feature Branch: https://salsa.debian.org/tails-team/tails/merge_requests/33

Parent Task: #10288

Original created by @intrigeri on 11606 (Redmine)