How can I make Safari cmd+number shortcut switch tabs instead of opening the bookmark associated with that number? I'm used to switching tabs with cmd+x where x is a number and takes me to tab x in firefox and pretty much every other browser I've ever used.
I like safari's speed and would like to try it a bit, but the cmd+x shortcut is burned in my brain and every time I use safari I end up screwing up.
I'd like to know if its possible to change this behavior, because this simple thing is a stopper for me.
In case you are coming from Chrome and want to use 

cmd+[0-9] for switching tabs (instead of cycling through your preset top sites) take a look at:

github.com/rs/SafariTabSwitching


  Safari Tab Switching is a Safari SIMBL plugin which allow switching between tabs using Cmd+1-9.


Update:

Safari Version 9.0.2 (El Capitan) has native support for this: