At many sites is difficult to find the information because of the authors of these sites often forget (or can not) make the search function. It is a fact. I have developed a simple extension (add-on) for Firefox, which solves this problem. The idea is simple - use the global search engines (Google, Bing, Yandex etc.). There are two options: 1. Select some text in the page -> popup menu -> "Search … in this site" 2. Write the required text in the standard search form -> press Ctrl + Enter or click the icon "Find" After that in a new tab opens search engine (which is default), with a list of pages of the current (active) site. Expansion has been tested and fully working with Google, Bing, AOL, Yandex, Rambler and Baidu. Working with other search engines is possible but not guaranteed. You can download the add-on from the Mozilla official website https://addons.mozilla.org/ru/firefox/addon/136629/