does not work in Firefox and IE

Line charts , the date on which there do not appear in Firefox and IE. More precisely , it does not appear correctly – you can see that the browser can not find a date . Either all dates are read as 1 January 1970 , and then instead of the graph , we see a vertical line down the middle , or the date can not be read at all, and we do not see any graphics at all ( although the grid is displayed , but without dates)

https://wordpress.org/plugins/visualizer/