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:
Safari Tab Switching is a Safari SIMBL plugin which allow switching between tabs using Cmd+1-9.
Safari Version 9.0.2 (El Capitan) has native support for this:
In most native OS X applications, the key presses Cmd-Shift-[ and Cmd-Shift-] will cycle left and right through tabs, respectively. Safari understands these.
If you use something like BetterTouchTool, then you can assign gestures (such as a three-finger swipe left or right) to these key presses, and get tab cycling across most of OS X.
Safari 9.0, released today for 10.9 Mavericks and 10.10 Yosemite, along side with the 10.11 El Capitan release, has introduced this natively.
There are two options. If checked, ⌘-1 through ⌘-9 will switch to tab 1 through 9, respectfully. This will change the original behavior of mapping to the favorites bar bookmark 1 through 9. Those will be changed to Command-Option-1 through Command-Option-9.
If unchecked, while it does not say it, the behavior is reversed. Command-Number will still be the favorites bar bookmark, while Command-Option-Number will be the tab. This flipping of behavior matches the Command-Click and Command-Option click behavior for opening a link.
I personally like the keyboard shortcut used in Chrome and Opera: Option+Cmd+(left/right arrow keys). This can be assigned in System Preferences-->Keyboard-->Shortcuts-->App Shortcuts. Press the plus button and add a pair for Safari with the command names "Show [Previous/Next] Tab" and then type the key sequences you want to use. Pretty handy. Good luck!