Hello,

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

Thank you.

You can also check for problems with the localstore.rdf file.

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

Do you still have a scroll bar (i.e. only the buttons are gone)?

Are you using the default Firefox theme (Tools > Add-ons > Appearance)?

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

Use a compressed image type like PNG or JPG to save the screenshot.

You can try to check if another Linux theme or icon pack brings them back.

Many thanks for the quick and informative replies. It turns out that this is not a Firefox problem. I should have examined more other applications; the scroll-bar arrows have disappeared from a bunch of those other applications.

Actually, this is an operating-system problem. With the upgrade from Fedora 17 to Fedora 18, the Gnome desktop, and various other desktops, quit displaying scroll-bar arrows. In Fedora 18, scroll-bar arrows are displayed in the KDE desktop, but not in most others.