By default, TestCafe launches browsers (Google Chrome and Mozilla Firefox so far) with a clean profile, i.e. without extensions, bookmarks and other profile settings. This was done to minimize the influence of profile parameters on test runs.
However, if you need to start a browser with the current user profile, you can do this by specifying the
:userProfile browser flag.
testcafe firefox:userProfile tests/test.js
runner .src('tests/fixture1.js') .browsers('firefox:userProfile') .run();