Even if you have not switched to El Capitan, chances are your Safari browser was updated to version 9.0. If you have been using Command–[1..9] to bring up favourites, you will find this no longer works but instead, switches between tabs.
To recover this function, go to Safari’s preferences > Tabs and turn off the default mode.
Monkeygirl Joys Tan on the brink of making the jump to El Capitan!
Mentioned this earlier this month on twitter, but worth putting it down on the blog.