Search field behavior
This is the search field with suggestions:
I typed "vivaldi b", the cursor is in the search field, but at the same time the first suggestion is selected. It looks like if I hit enter, I'll get "vivaldi browser" results, but it's not true. It feels uncomfortable: to actually use first suggestion, I need to press down, up, enter. I think it's a bug: first suggestion should not be selected by default, and to select it, user needs to press down once. Also, is spellchecking really needed in the search field?
Another slight inconvenience after switching from Firefox is how you change the search engines. You can change them before you started to type by pressing down, but not after you typed something. In Firefox you could change the search engines by pressing ctrl+up, ctrl+down. I think it was very convenient.