With the "Drag & DropZones" mode of the "Selected Text Searchers" extension, one can highlight some text on the page and then "drag" it, whereupon a screen of defined search engines appear as an overlay on the page, allowing for "dropping" of the text on top of any of the search engines, initiating using that search engine to search for the highlighted text. This stops working after 148.0: the search engines overlay does not come up, replaced with only the non-working icon on the mouse cursor.