Best text search on page/in all tabs: count/regex/visualize & list result/find-as-you-type. Optional Instant web/history search in URLBar. Best custom search, multi-tab preview for selected text, dnd image/lnk to save/open, autocopy.
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The extension is currently not working on Firefox 57. It still works on XUL-based Firefox forks like Waterfox and Pale Moon