Here are some very useful terminal commands and tips for hidden Mac OS X settings.

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• Finder
• Dock
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The best collection of handy Terminal Commands for Leopard Tweaking is a post from: My MacOS X

Hidden features in Snow Leopard from MacWorld is a post from: My MacOS X

about:config into the Firefox address bar.

And press enter .

Clicking “I’ll be careful, I promise!” brings up a huge list of preferences, most of which aren’t accessible from the normal Preferences dialog. As the list is so long, the best way to find things in it is to start typing the name of the preference into the “Filter” box at the top. Once you have found the one you want, double-clicking it allows you to change it.
In list below you will see 10 hidden FIREFOX 3 preferences (only some work in Firefox 2).

1. browser.urlbar.clickSelectsAll

The default behaviour, true, means that when you click the address bar, it automaticall selects all. Changing this to false stops this, and just inserts the cursor where you clicked.

2. browser.tabs.closeButtons

By default, Firefox displays a close button on every tab. Setting this preference to 0 will only display a close button on the currently open tab. Setting it to 3 will move the close button to the far right end of the tab bar, and setting it to 2 will get rid of all close buttons.

3. browser.search.openintab

Double-clicking this will set it to true. This makes searches from the box in the top right open in a new tab rather than the current one.

4. browser.urlbar.maxRichResults

Determines the maximum number of results that drop down from the URL bar when you start typing. Default is 12.

5. browser.tabs.loadFolderAndReplace

If you open a whole folder of bookmarks at once using “Open All in Tabs”, they replace all of your open tabs. Setting this preference to false will cause the new tabs to only replace the current tab and add in the rest after it.

6. accessibility.typeaheadfind.casesensitive

Setting to 1 Makes the Find function (Command-F) case sensitive.

7. ui.click_hold_context_menus

Set this to true to enable the click-and-hold way to open contextual menus.

8. browser.tabs.tabMinWidth

If you open lots of tabs in Firefox, they shrink down so they all fit across the screen. After a certain limit, your tabs don’t get any smaller and you have to scroll to the left and right to view other tabs. This preference allows you to set the minimum width. Default is 100, lower values will give smaller tabs.

9. layout.spellcheckDefault

Changing this value to 2 makes the spell checker work in all text boxes, not just the large text fields.

10. browser.backspace_action

This changes the behaviour of the backspace key. setting it to 1 makes the backspace key scroll up a page in the current window. Shift-Backspace will scroll down. 2 to make the backspace key do nothing. Except delete when text is selected, of course. Changing to 0 will change back to the default behaviour of going back a page.

Hidden Firefox Settings is a post from: My MacOS X