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Ctrl Key Not Working as Intended on Penpa+ Web Application

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On the Penpa+ web application, in Sudoku Mode, the Ctrl key should allow selection of multiple cells/squares by keeping the Ctrl key pressed and clicking on different cells/squares. However, this is not working on Firefox. It works on Chrome. I am using a Macbook Air M1 (2020) model with MacOS Big Sur (11.3.1). Why is Ctrl key working differently on Firefox and how can I make it work as intended for this web application?

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