Make sure that toolbars like the "Navigation Toolbar" and the "Bookmarks Toolbar" are visible.

• Firefox menu button > Options
• View > Toolbars (press F10 to display the menu bar)
• Right-click empty toolbar area

Use Toolbar Layout (Customize) to open the Customize window and set which toolbar items to display.

• check that "Bookmarks Toolbar items" is on the Bookmarks Toolbar
• if "Bookmarks Toolbar items" is not on the Bookmarks Toolbar then drag it back from the toolbar palette into the Customize window to the Bookmarks Toolbar

• if missing items are in the toolbar palette then drag them back from the Customize window on the toolbar
• if you do not see an item on a toolbar and in the toolbar palette then click the "Restore Default Set" button to restore the default toolbar setup

• https://support.mozilla.org/kb/How+to+customize+the+toolbar
• https://support.mozilla.org/kb/Back+and+forward+or+other+toolbar+items+are+missing

You can check for problems caused by a corrupted localstore.rdf file if the above didn't help.

• http://kb.mozillazine.org/Corrupt_localstore.rdf

Current Firefox versions require OS X 10.6 or later, so if you want to continue using Firefox beyond Firefox 16 then you need to update to OS X 10.6.8 or later.

• https://support.mozilla.org/kb/firefox-no-longer-works-mac-os-x-10-5

Firefox 16.0.2 is the last version that works on an Intel Mac with the OS X 10.5 operating system.

• https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/16.0.2/mac/

Another option to consider is to install the last Firefox 10.0.x ESR version as that version is more recent than the Firefox 16.0.2 version.

• https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/10.0.12esr/
• http://www.mozilla.org/en-US/firefox/10.0.12/system-requirements/

See also:

• http://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported
• http://code.google.com/p/tenfourfox/wiki/QuickTimeEnabler

• http://code.google.com/p/tenfourfox/wiki/AAATheFAQ

I have followed all the steps and still stuck at the customize window. I drag bookmarks to the customize window, but when I click on it nothing happens. They don't show up as a list only as bookmarks. How can I move them around if they don't display individually? Thanks

You can only place the "Bookmarks Toolbar items" on a toolbar in Customize mode.
You can drag bookmarks or a link on that toolbar (that toolbar shrinks to an icon in Customize mode).

Then you should be able to drag a link into that folder.
Bookmarks that appear on the toolbar need to be located in the Bookmarks Toolbar folder.

• https://support.mozilla.org/kb/how-do-i-use-bookmarks

I didn't get the customized process figured out, but the last link to manually organizing your bookmarks was a "piece of cake". Thanks!