CTRL + SHIFT + T : Open the most recently closed tab
CTRL + shift + t instantly reopens the last tab you closed (the more you press it, the older the tabs you’ll dredge up). If you usually have more than one tab open while you browse, this trick can be a life-saver. Try it now, and never forget it. If you want to open a new tab altogether, just hit CTRL + t.
CTRL + back arrow: Go back one page in your browsing history
CTRL + back arrow is your effortless, mouse-free way of going back one page in your browsing history. Didn’t mean to do that? Hit CTRL + forward arrow to move forward one page. Now the Internet is like one big eBook to flip through at your leisure!
In Facebook: J and K for effortless scrolling
Want a more satisfying Facebook experience? On your newsfeed, hit the J key to instantly highlight the next article down in your feed; hit the K key to move up one article. Once you have an article selected, hit the L key to like it, sans clicking.