Excellent little addon (checked the code by extracting the .xpi), does exactly what it says on the tin. One minor issue is that the icon it adds (a few dark grey horizontal lines) doesn't really stand out, making it a bit difficult to spot. Works fine once you know where to find it, though.

Thanks!

Just works. Automatically creates a button in the toolbar which lets me sort by URL or title.

Ehh, how does this work? I installed it, but I see no way to sort tabs or a subset of tabs. Please give a little manual in the description.