If pressing Ctrl+F on the keyboard requires too much effort, Firefox allows you to bypass that step. Once enabled, this Firefox feature will automatically start searching a page the moment you start typing. It won’t search if you have a text input box selected, so for the most part there is nothing to lose by enabling it. Here’s how:
Open Firefox and click the top-left orange Firefox > Options menu button.
In the options menu visit the Advanced tab and check the box labeled “Search for text when I start typing.” Click OK to save changes.
Now when browsing a page with Firefox, you can start a page-wide search by simply typing. A search box will automatically appear at the bottom-left and matching text will be highlighted throughout the page, just as it would if you used the Ctrl+F search.