Looks like Firefox 2.0 has the accesskey set to Alt-Shift by default.
Type "about:config" into your menu bar.
Enter "ui.key.contentAccess" into the filter line
The value is probably currently 5. Right click on the line and select Modify and change it to 4.
Now, this will disable Alt for accessing menu shortcuts. However, it will mean that menu keyboard shortcuts are also triggered by Alt and there could be conflict.
To change what triggers menu shortcuts modify "ui.key.chromeaccess"
In either item possible values are:
1 - Use Shift
2 - Use CTRL
3 - Use Shift-CTRL
4 - Use ALT
6 - Use CTRL-ALT
7 - Use Shift-CTRL-ALT
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