Odpowiedzi:
http://dougal.gunters.org/blog/2004/12/15/firefox-inline-autocomplete
Zacytować:
To turn on inline autocomplete in the Firefox web browser…
Enter about:config in the URL field
Right-click on the page and create a new Boolean value
Enter browser.urlbar.autoFill as the preference name (note, case-sensitive: ‘F’, not ‘f’)
Set the value to true
Zalecam przeczytanie tego: Zmiana zachowania autouzupełniania - Firefox.