Unable to connect to browser:chrome

i am able to connect to Ie, but not Chrome or Firefox:

f3 has thrown an exception

Source: Open browser

Message: Cannot communicate with the browser, please check the UiPath extension.

Exception Type: BrowserOperationException

UiPath.Core.BrowserOperationException: Cannot communicate with the browser, please check the UiPath extension. —> System.Runtime.InteropServices.COMException: Cannot communicate with the browser, please check the UiPath extension.
at UiPath.UiBrowserClass.Open(String bstrURL, UiBrowserFlags flag)
at UiPath.Core.Browser.Open(String url, Boolean privateSession, Boolean headlessSession, Boolean defaultSession)
— End of inner exception stack trace —
at UiPath.Core.Activities.ScopeActivity.EndExecute(NativeActivityContext context, IAsyncResult result)
at UiPath.Core.Activities.AsyncNativeActivity.BookmarkResumptionCallback(NativeActivityContext context, Bookmark bookmark, Object value)
at System.Activities.Runtime.BookmarkCallbackWrapper.Invoke(NativeActivityContext context, Bookmark bookmark, Object value)
at System.Activities.Runtime.BookmarkWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)

Did you install uipath extension for chrome?

Yes. I installed and also followed Chrome Extension Troubleshooting.

The console shows:
registering to chrome.runtime.onMessage
Loader.js:134 OnPageLoad not available; retry in later
Loader.js:159 runtime.onMessage request uiPathContentScriptLoadRequest
Loader.js:167 code available

Could you please collect some traces so we may take a look?
see: https://robot.uipath.com/v2017.1/docs/enabling-low-level-tracing

Adrian.