Don't know what's gone wrong with Firefox Google browsing.
If I enter a search term and hit the 'search' button nothing happens.
If I then hit F5 it carries out the search and returns the result.
This problem appears with:
https://www.go ogle.com/
https://www.go ogle.co.uk/
but not with:
https://www.go ogle.com/webhp?complete=0
http://www.go ogle.com.au/
(spaces entered to prevent auto-conversion)