On many sites it is not easy to find the necessary information due to the fact that site creators often forget (or cannot) make the site search function. It is a fact. I have developed a simple Firefox extension that solves this problem.
The idea is simple - use search engines (Yandex, Google, etc.) to search the site. Two options are possible:
- Select a fragment of text on the page -> in the context menu, select "Find ... on this site"

- Write the search text in the standard search form -> press Ctrl + Enter or click "Search"

After that, a new search engine (which is selected by default) will open in the new tab with a list of pages of the current (open) site, on which there is a search text.

The extension has been tested and works completely with Yandex, Google, Bing, Rambler, AOL and Baidu. Working with other search engines is possible, but not guaranteed.
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You can download the extension from the
official Mozilla website .