Description of problem:

If horizontal scroll from a pointing device is enabled in OS, X11,
and Firefox, then Firefox scrolls backwards.

Version-Release number of selected component (if applicable):

3.0-0.beta2.12.nightly20080121.fc9

How reproducible:

100%, easy

Steps to Reproduce:

1. First you must establish that your pointing device works correctly.
   This step ensures that you don't have your buttons remapped inside
   X to suit Firefox

1.1 Open a text file with a 80 character line in gedit (actually
    any app will work, only Firefox is backwards, but let's use gedit)
1.2 Go Preferences->Editor, uncheck "Wrap"
1.3 Return to text. Move horizontal scroller, verify operation.
    For example, on a laptop with Synaptics, moving finger to the
    RIGHT will move the SCROLL TAB to the RIGHT. Compare with the
    operation of the vertical scrollbar, it should be the same.

If you scroll backwards at that point, fix it in your X setup

2. Run Firefox
2.1 Go to about:config, set this:
mousewheel.horizscroll.withnokey.action;0
2.2 Verify that every other mouse setting is at default
2.3 Find something wide, like Red Hat Bugzilla
2.4 Narrow the browser window until horizontal scroll-bar appears
2.5 Scroll it, verify operation
    It's backwards

Actual results:

Horizontal scrolling is backwards

Expected results:

Horizontal scrolling same as all other GNOME applications

Additional info:

This is NOT a regression in Firefox 3. It was like that for years,
but finally I figured that it's not going to get fixed by itself
unless I report it.

BTW, keep in mind that at least in GNOME the X cursor has to be
inside the window or the scroller won't work. Even menu or tab
areas of the browser are no good.