Hi Tomas,
We cannot reproduce this issue on our side.
What version of FireFox are you using? TC 7.52 supports Firefox ver. 1.5.0.1 - 3.5.
Also, make sure that you run TC under as administrator. Here is a quote from the "TestedApp.RunAs" help topic:
In order for TestComplete to be able to test the application that is launched with the RunAs method, it is recommended that TestComplete is running under the administrator account. If TestComplete is running under a user account, it may not have enough permissions to retrieve information about the tested application’s windows and objects. |