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FindOnPage Bookmarklets

When visiting a Google*) Search result page, for every keyword a bookmark with javascript (i.e. a bookmarklet) is added to the bookmarks toolbar. Make sure you have that toolbar visible, see the other screenshots on the Firefox add-on page. Each bookmarklet highlights its keyword in any open browser tab and scrolls that page to the n_th occurence when clicked n times.

An extra bookmarklet with a black triangle ▲ scrolls upwards to the previous occurence of the current search term

The bookmarklet with half a square ◧ toggles between exact and partial match ("new" matches "news")

Preconfigured for Google, Bing, Duckduckgo, Yandex. See options.
Note: Highlighting won't work on pages where Content Security Policy (CSP) blocks bookmarklets in general (e.g. news.google and yandex .com).

Install
If your screen resolution is high enough to fit much into one row, you can integrate the bookmark toolbar's content into the menu toolbar via Customize... (right-click on the three horizontal bars for Settings), since you need to add one row for the bookmark buttons anyway, and sometimes the direct access to File/View is handy. Then you can uncheck the now empty bookmarks toolbar because everything happens in the menu bar now. First make the bookmarks toolbar visible, e.g. via a right-click on the three horizontal bars in the browser's upper right corner.
Personally, I prefer to have the old fashioned menu bar (File/View/...) visible as well, because I can drag the bookmark toolbar's content into that menu bar, too, using Bookmarklets are bookmarks with javascript instead of normal URLs. They show up in