Looking for an addon to automatically select all instances of selected word in the current page

Question

I am looking for an addon to install so that when you select a word in a webpage ( by clicking) it automatically highlights all the instances of that selected words in that

Answer 1

If you press ctrl+f and then click highlight all it will do it.

If you want to copy it heres the code for highlihgt all:

function toggleHighlight(aHighlight) {

          if (!this._dispatchFindEvent("highlightallchange"))
            return;

          let word = this._findField.value;
          // Bug 429723. Don't attempt to highlight ""
          if (aHighlight && !word)
            return;

          this.browser._lastSearchHighlight = aHighlight;
          this.browser.finder.highlight(aHighlight, word);

}

here it is on mxr

if you need more help let me know