Quick Find Bar Tweaks
Adds ‘next’ and ‘previous’ buttons to the Quick Find Bar and controls how long the bar remains displayed

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Tweak Type:	Display
Fx 2:	YES
Fx 3:	YES
Fx 3.5:	YES

Note: For this tweak I recommend using the ChromEdit Plus and about:config extensions.

Restoring the “Find” Buttons

For some odd reason in Firefox 2, the Quick Find Bar (activated via “/”) does not display the “Find Next” or “Find Previous” buttons. To restore these buttons, simply add this line to your userChrome.css file located in your profile folder

/* Add Next/Previous Buttons to Quick Find Bar */
#FindToolbar > * {display: -moz-box; }


When you are done editing your userChrome.css file, close and restart Firefox and the changes should take effect right away.

Increase the Quick Find Bar Latency

By default the Quick Find Bar’s Latency (the time it remains displayed after you stop typing) is about 5000 Milliseconds (5 seconds). The amount of time can be adjusted via a change in about:config.

Click the about:config button (if about:config extension is installed) or open a new tab and type about:config in the address bar and press enter

In the filter field type accessibility.typeaheadfind.timeout

Double-click on the entry and in the pop-box enter the number of milliseconds (1 second = 1000 milliseconds) to keep the bar displayed after you stop typing

Click OK

Close the tab or about:config window

Changes take effect right away

Source