1/ How to Force Quit an unresponsive app in macOS Sierra — Of course, try quitting it in the normal way first by choosing Quit from the app’s menu in the menu bar, or press Command (⌘) and while it’s held down, the Q key, or click-and-hold on the app’s icon in the Dock and choose Quit from the pop-out menu that appears.
But if a Mac app acts up and you have to stop it running, you may have to force it to quit so you can relaunch it. Here’s how you use Force Quit in macOS Sierra:
Choose Force Quit from the Apple () menu, or press Command-Option-Esccape (Esc at top left of your keyboard) all together. (This is similar to pressing Control-Alt-Delete on a PC.)
Select the app in the Force Quit window, then click Force Quit.
2/ Automatically select the best email account in macOS Sierra — You can have Mail in macOS Sierra automatically select the best email account for a new message based on who the email is addressed to and what mailbox you selected when our began composing your new email.
With Mail up and running, click Mail, then Preferences from the top menus.
Click on the Composing tab.
There is a drop-down next to Send new messages from. Choose that to view your options.
3/ Archive information out of the Contacts program — In Apple’s Contacts app, Choose File > Export > Export vCard. This works for any individual card you have selected, but also for entire groups if you select one on the left, or All Contacts for all of them.
Once you’ve selected File > Export > Export vCard, your Mac will ask you where you’d like to save it, and you’re done! This’ll create a .vcf file in your chosen location, and if at any point you’d like to bring back those people, just double-click on the file to reimport their cards.
4/ Check for malicious extensions in Safari — If you find that your browser is still acting weird, you may need to look to see if the adware you picked up added an unwanted extension to Safari.
Safari extensions are software programs you can install to customise the way your browser works. For example, extensions can show news headlines in a bar below the toolbar, change the appearance of web content, or add buttons to the Safari toolbar.
In order to provide these features, extensions may access the content of the webpages you visit. It’s good practice to check which extensions you have installed and make sure you are familiar with what they do.
To check, open the program, then click on Safari > Preferences from the menus at the top. Choose the Extensions tab at the top, and you’ll see the list of what’s been installed. If you see something in your own list you’re unfamiliar with, you can either disable it by deselecting the checkbox I’ve indicated above or remove it completely using the Uninstall button.
5/ Open a playlist in a new window in iTunes 12.6 on macOS Sierra — With the release of iTunes 12.6 on macOS Sierra, Apple restored the ability [YAY!] to open a playlist in a new window. Why this feature was ever removed shall forever remain a mystery. But here’s how you can open a playlist in a new window.
Control-click or right-click on the playlist you want to open and select Open in New Window. That’s it.