Search tools display just before any social or listing website icons in the Prospect View. Tick "Auto open" at the start of the button row to open the last used button again for each next prospect.

Search Tools in Prospect View
Admins choose the search tools in Settings: on the "Link manager" card, open the "Search tools" popup ("Select which search tools to display for every prospect"), tick the ones you want and click "Save". Remove one with its bin ("Remove search tool"). Built-in search tools include Linkedin, Facebook, Google maps, Google search, Trustpilot and Tripadvisor.
Any Listing Website you add with "Search url active" switched on can also be used as a search tool.
For any specific prospect, the search tool will not display if a url for that listing site has been added (the Linkedin search tool stays). In this case, the standard icon for the listing site is shown, and clicking it opens the specific listing site url.
Whenever a search tool icon is clicked, a search is performed within the target site for the company.
For Listing Websites, the "Search base url" determines the search method: by default a Google search is performed within the listing website. However a site-specific search url can be entered for the Listing Website, and its "Main search parameter" says whether the company name or domain is searched for.

Add the search url for a Listing Website
For the youtube search tool for example, the search url is https://www.youtube.com/results?search_query=COMPANYNAME.
Try searching for a company within the Listing Website and see if the url displayed looks something like this. If so, copy everything up to COMPANYNAME (following the above youtube example) and paste it as the search url for the specific Listing Website (in Settings / Listing Website). Alternatively, you can keep the default google site search url if you prefer.
When you use a search tool you may find the profile page for your prospect in that listing site. If so, just right-click on the link to the profile page, or anywhere within the profile page (without highlighting any text), and pick "Add URL" from the ProspectSafari extension to add the url to the prospect record. Now, the Search Tool will no longer be shown for that prospect, but the listing site icon will be shown instead, allowing you to access the profile page directly.