Installing old OS X versions: fixing “OS X could not be installed on your computer”

Here in Belgium schools are locked down due to #coronavirus. With the school of my two oldest kids now switching to remote teaching, I took the time to set up my old MacBook Pro (model late 2008) for my two oldest kids to use. That didn’t go without any hiccups though: the OS X installer […]

Disable all Keyboard and Trackpad Input with Little Fingers

If you have a toddler running around, Little Fingers by Shaun Inman – who created it for his own need – will come in handy. Little fingers want to explore. Press Shift + Control + Option + Command + L to lock down your Keyboard, Trackpad, Touch Bar, and/or Mouse. Press it again to unlock. […]

Targetting the OS X System Font in CSS

body { font-family: system-font, -webkit-system-font, -apple-system-font, “.SFNSDisplay-Regular”, HelveticaNeue, LucidaGrande; } On a fresh install of OS X 10.11 (El Capitan) there’s no San Francisco font installed. But it’s the system font, so how is this possible? Hence the sort of magic above to actually get it working. I Left My System Fonts in San Francisco […]

Mavericks Multiple Screens vs Jumping Dock

When working with Dual/Multiple Screens in OS X Mavericks and having “Displays have separate spaces” switched on, I noticed that the dock would unpredictably switch monitors from time to time. Fed up with this I spent a Google Search Coupon on the issue and guess what: it’s not a bug, it’s a(n undocumented) feature. To […]

Building OS X Apps with JavaScript

OS X Yosemite introduced JavaScript for Automation. This makes it possible to access native OS X frameworks with JavaScript. The result above can be built using this code: ObjC.import(“Cocoa”); var styleMask = $.NSTitledWindowMask | $.NSClosableWindowMask | $.NSMiniaturizableWindowMask; var windowHeight = 85; var windowWidth = 600; var ctrlsHeight = 80; var minWidth = 400; var minHeight […]


Bartender lets you organize your menu bar apps, by hiding them, rearranging them, or moving them to Bartender’s Bar. You can display the full menu bar, set options to have menu bar items show in the menu bar when they have updated, or have them always visible in Bartender’s Bar. Bartender → (via @Inferis)