I regularly search for text within textarea textboxes, e.g. on https://www.britishnewspaperarchive.co.uk/
It would be very useful if the message on the Find bar "Reached end of page, continued from Top" would appear in a highlight colour for a few seconds to draw attention to the event.
This would probably be an easier to implement option than my suggestion https://connect.mozilla.org/t5/ideas/display-search-locations-on-textarea-vertical-scroll-bar/idi-p/... to mark all occurrences of a search text on the vertical scrollbar of a textarea.
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This is also useful for long pages where it is easy to miss the roll-over at the end of the page, for example https://www.genuki.org.uk/big/eng/DUR/Transcriptions/STD1765#:~:text=Longstaff
NOTE: I have include the text fragment in the link. Chrome already interprets the #:~:text=Longstaff to highlight and a single text on the page, but does not use this as the Find string or highlight all the occurrences of the string, nor does it make it easy to create the link. See the suggestion: https://connect.mozilla.org/t5/ideas/support-text-fragments-and-create-uri-from-the-find-bar/idi-p/2...