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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).

Developer comments

The idea is: On a google search result page, the keywords in the search field will be used to create one bookmarklet per keyword in the bookmarks toolbar. The bookmarklets when clicked upon will dispatch a custom event "swpfsmod" with detail.kw information that contains the respective keyword.

The content script attaches an eventListener for swpfsmod to the current document, which handles the highlighting etc. of the current tab using the JQuery 3.3.1. javascript library (https://jquery.com/) and the
Mark.js highlighting extension (https://markjs.io/).

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