To run and record the tests, BugBug requires you to install a BugBug Chrome Extension and enable it in Incognito mode.
Why does the extension require incognito mode?
All your tests should be independent of each other. Every test should begin with a clean session, without any cookies, cache, localStorage, etc. To achieve this BugBug runs the tests in incognito mode. Every time you run the test, the previous incognito session is closed and a new incognito window opens, with a completely clean session.