I have used Google for years. Today, something called Bing has appeared instead. I can still get to Google but this involves a second operation. How can I restore Google as default please?
I've altered the title of my reply as your search engine has changed - not your browser. Very easy to change in Firefox as clicking on the magnifying glass symbol on the left of the search box takes you to the right bit of the settings.
But you don't say which browser you are using, but it is still going to be in the settings menu.
Bing is not a bad search engine - I often use it as, while it does have ads pushed, it often brings up better results when looking for "stuff", rather than information.