When I open a webpage, a want to search for a determinate word on this webpage. I was used to this on Explorer, but on Mozilla I don't know.

Hi, Pressing '''Ctrl''' + '''F''' opens '''Find''' over the status bar (bottom). Press X to close it. You can also activate another another feature known as '''Quick Find''' by pressing '''/''' (forward slash). Alternatively you can use Quick Find without pressing '''/''' by activating it permanently in '''Tools''' ('''Alt''' + '''T''') > '''Options''' > '''Advanced''' > '''General''', enable (tick) '''Search for text when I start typing'''. [https://support.mozilla.org/en-US/kb/Searching%20within%20a%20page?s=quick+find&r=0&e=sph&as=s Searching within a Page] [https://support.mozilla.org/en-US/kb/Options%20window%20-%20Advanced%20panel?as=u Options > Advanced]