[S58] O1.1 - Set up QA and regression test infrastructure
Work with Mozilla to identify if any existing Firefox testing infrastructure can be used to run automated tests on our rebased codebase.
Evaluate Firefox tests and Try builds to identify any currently broken functionality.
Audit existing Tor Browser tests to identify which tests are missing and need to be written; audit existing Firefox tests to determine which tests need to be disabled because they test undesired behavior in Tor Browser.
Configure integration testing infrastructure.
Fix existing regression tests that are currently failing after testing and audits.