this is not bug, but would be nice to implement it. Most of Linux (and Xfce) applications support browsing tabs using ctrl + page up/down keys, like Mousepad, Iceweasel, xfce4-terminal and many, many others. In current state in Thunar, the ctrl + page up/down keys do the same thing like page up/down key alone (move scroll bar up or down). So would be nice if this key combinations (which are not used) will be used for switching tabs. It is small detail, but i would greatly appreciate it.
Thanks for your time!
Apparently this is a duplicate of bug 9585.
*** This bug has been marked as a duplicate of bug 9585 ***