Hacking Firefox: The secrets of about:config User Interface
Get case-sensitive, in-page searches
The integer preference accessibility.typeaheadfind.casesensitive controls how Firefox's "Find as You Type" feature behaves. The default is 0 for case-insensitive searches; set it to 1 for case-sensitive matching.
Control address bar searches
You may have noticed that if you type something into Firefox's address bar that's not an address (a "keyword"), Firefox typically passes it on to Google as an "I'm Feeling Lucky" search term. The exact search engine string to use is defined in the string preference keyword.URL; if you want to change it to something else, you can simply edit this string.
For instance, to make Microsoft's Live.com the default keyword search, set this string to
http://search.live.com/results.aspx?q=
For a Yahoo search, it would be
http://search.yahoo.com/search?p=
If you want to restore the default search, use
http://www.google.com/search?ie=UTF-8&oe=
UTF-8&sourceid=navclient&gfns=1&q=
Finally, if you want to turn this address-bar keyword functionality off altogether, set the Boolean preference keyword.enabled to false.
Note that with Google, the more generic the keyword, the less likely it is to be used as an "I'm Feeling Lucky" search -- although what constitutes "generic" isn't always clear. For instance, typing "clean" into the address bar returns a generic Google search page, but "sideways" takes me to the Internet Movie Database entry for the movie of that name (the "I'm Feeling Lucky" result). Your mileage will almost certainly vary.
Select just a word
The Boolean preference layout.word_select.eat_space_to_next_word governs one of Firefox's tiny, but for me incredibly annoying, little behaviors. When you double-click on a word in a Web page to select it, Firefox automatically includes the space after the word. Most of the time I don't want that; I just want the selection to stop at the end of the word. Setting this to false will defeat that behavior.
Select a word and its punctuation
Somewhat contrarily, if you double-click a word that's next to any kind of punctuation mark, Firefox defaults to selecting only the word itself, not its adjacent punctuation. Set the Boolean preference layout.word_select.stop_at_punctuation to false to select the word and its adjacent punctuation.
Get Alt-hotkey shortcuts back
One minor change in Firefox 2 was the way in which form elements on a Web page had hotkey bindings assigned to them. In Firefox 1.x, when a Web page assigned a hotkey to a form element, you pressed Alt-hotkey to access it. In Version 2.x, this was changed to Alt-Shift-hotkey. To revert to the original 1.x behavior, set the integer preference ui.key.contentAccess to 4. This is useful if you have, for instance, a Web-based interface you spend a lot of time in, and use Alt-key bindings to do things quickly in that particular page.
Note that one possible consequence of setting this back to the old behavior is that Alt-key bindings on a Web page can now override the default key sequences for the program itself (such as Alt-S for History), but you can always get around this by tapping Alt to activate the menu and then tapping the program hotkey in question.
Change scrollbar behavior
By default, clicking in the empty areas of the Firefox window's scrollbar will simply cause the view to move up or down one page. You can change this behavior by creating a Boolean preference called ui.scrollToClick and setting its value to true. Now clicking in a scrollbar will cause the view to jump directly to that point in the page (basically the same as dragging the scrollbar to that position).
Get click-and-hold context menus back (for Macs only)
If you want to restore the classic click-and-hold context-menu behavior on the Macintosh, edit or create the Boolean preference ui.click_hold_context_menus and set it to true.
