i always repeat adding same bookmark because my firefox does not recognize that it already saved before

when i like any page or site and saving it in bookmark for later it's saved without problem but after while when i join that site again by chase and like it again i adding it again in bookmark because firefox not recognize that it already saved before its should appear in bookmark tap (edit this bookmark) instead always show (bookmark current tab) i checked my bookmark profile and its all there not deleted just repeating and keep add more versions for same link its looklike disabled links or offline and i have to open it again from (manage bookmark menu) to make it active and apearing in bookmark menu again