@WMDE-leszek I think I know how to do it, but I don't think it's needed to run tests targeting beta cluster. I'll try a few things, maybe the job needs to be refactored.
@Addshore can you help? Do you need more information?
Wed, Jun 20
Tue, Jun 19
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Fri, Jun 15
I think this is resolved. Please reopen if there is anything left to do. I will work on T161697: Run Selenium tests using Firefox soon, but I don't think it is blocking this task.