Unable to reproduce in current version of Firefox.
解决办法
Upgrade to Firefox 3.x.
Use the following code to disable the Pan mode:
// temp hack to eliminate pan lock within
// FireFox 2.0.0.20 (WindowsXP & RedHat 5.2)
dojo.connect(map, "onLoad", function() {
dojo.connect(map, "onMouseOut", function() {
map.disablePan()
});
dojo.connect(map, "onMouseUp", function() {
if(!map.isPan() {
map.enablePan();
}
});
}