The extension should show previews of tabs, along with matching terms as you type along. In some browsers, you should find it named as Find in Page, Find on Page, and so on. In Chrome, for example, select the More icon (three dots) to the top-left of the browser window and pick Find.
You should likely see Find listed inside it. Just look for an icon with three dots or three stacked lines on any corner of the window to reveal the browser menu. The keyboard shortcut aside, you can also rely on browser controls to open Find. How to Open Find Using Desktop Browser Controls To do that, simply press Control + U (PC) or Command + U (Mac), or right-click or control-click a page and select View Page Source. Tip: You can reveal the page source (or HTML) and use Find to search for text that appears hidden from the front-end of a web page. Once you’ve finished looking for what you want, press Esc or select the x-shaped button to exit Find. You can also use Find in multiple tabs, but you can’t search through all open web pages from a single tab. If you want, you can navigate to another tab and come back, and the Find bar will remain available.