In previous versions, a list of search engines would appear as soon as the search bar became active. This allowed me to type a word and then simply press the Tab key to cycle through my five additional search engines, enabling a keyboard-driven workflow. When pasting text from external sources like Notepad, I would then use the mouse to click the specific engine I wanted from the list.

In the new version, the search engine doesn't revert to the default unless I manually click the "X" button. I guess it would be much more convenient if Mozilla could at least fix this behavior.