For those of you who want to change tabs quicker in Firefox, here’s a quick round-up of commands you can use for that:
Ctrl+Tab – This will immediately switch to the next tab
Ctrl+Number – Every tab is “virtually” numbered from left to right so if you press Ctrl+1, that will switch you to the very first tab, Ctrl+2 will switch you to the second tab and so on.
For Macs, just use Command button instead of Ctrl.
Also, you can close a tab anytime using Ctrl+W, I use this frequently.