I would advise u to suggest Internet Explorer 11 as it work like a charm.
Mozilla and Chrome on certains scenarios give u “Com Component Error” so best if u avoid Mozilla and Chrome.
Well, if using them is the only choice then try this:
Sometimes even when you install the Firefox Extension or Chrome Extension it keeps prompting u to install the extension.
First of all un-install the UiPath application -> delete all the files (including hidden files from installation directory ) and restart your system -> Reinstall it again.
Turn off the UiPath Robot Service (tsk Mgr - Service Tab -> UiPath Robot) and Launch UiPath and then try to install the Mozilla and Chrome Extension before u start off with any Automation project .
Once installed -> restart System -> Start the UiPath robot service and Launch UiPath again.
This would Resolve the issue , as I also faced the same Issue.