When you click the Search-button or hit CTRL+F the viewer's search window takes a very long time before it's usable. In my quick tests it took around 6 seconds before the website was showing and another 6 seconds before the Cookies-popup appeared.
Re-opening the window does not seem to change wait times a lot, and also the Cookies-popup keeps re-appearing. Furthermore, once the website has appeared after the initial 6 seconds, it's not clear to the user that the text input field often isn't ready yet which may add to frustration when they click the input field but the cursor won't jump into it.
The website https://search.secondlife.com works just fine for me in any regular browser outside of the viewer, showing instantly.
Making the search window faster and more responsive may help the general acceptance of the viewer's web search. Most people who I know prefer the old "Places" search that is still part of many 3rd party viewers.
Similar issue applies to World > Events.