My centre search bar will not work, I type in it then hit search or enter but no response, it does absolutely nothing. What is wrong and how do i fix?

when i start up firefox it loads as normal. I have the main web search bar (top left) and the google search bar (top right) then there is also the mozilla logo and third search bar just below it in the centre of the screen. This was my main bar as i liked the feature of left clicking in it and it instantly displaying my last searches and choosing from them what i wanted to do. Now it has just stopped working, it has none of my last searches stored and whatever i type in it doesn't matter anyway as it just doesn't do anything, it is totally non responsive. help please?

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