Many, like me, are puzzled by the fact that Opera's browser, which is on the forefront of web standards, is so poorly supported in Google services.
But I still want to get various buns from Google. For example, instant search, the graphic background of the Google homepage and the site preview that appeared today.
You can do this simply:
Open google
Click on the page with the right button and select the item “Settings for the site”
Select the "Network" tab
In the "Browser Identification" drop-down list, select "Submit as Firefox"