Hi

This support article should help:

https://support.mozilla.org/en-US/kb/how-replace-google-assistant-firefox-search

It is not possible to open Chrome page shortcuts in Firefox for Android (and the other way round) at this time.

thank you

Hello,

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution.

Thank you for contacting Mozilla Support.

Paul said

Hello, I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution. Thank you for contacting Mozilla Support.

'I spoke too soon. "How to replace Google Assistant with a Firefox search" suggests the following, but I don't have those settings on my Samsung Galaxy s10e. I searched, but nothing comes up for "Assist & voice input

On Pixel XL and Android 8.1

   Open the Settings app on your phone.
   Tap Apps & Notifications.
   Tap Advanced.
   Tap Default Apps.
   Tap Assist & voice input.
   Tap Firefox. 

If you search the Settings app for "default digital assistant", does this help?

Nope. Lots of results, but virtually all are either Google Assistant or Accessibility related.

If you search the Settings app for "default", you should see "default digital assistant app" as one of the results.