Script to automatically replace `http://` with `macappstore://` (and `https://` with `macappstores://`) on Lion, Mountain Lion, and Mavericks.

mas.js

// 1. Add `data-mac-app-store` attribute to all Mac App Store links.
// 2. Use this script to automatically replace `http://` with `macappstore://` (and `https://` with `macappstores://`) for those links on Lion, Mountain Lion, and Mavericks.

if (/Mac OS X 10[_.][0-9]/i.test(navigator.userAgent)) {
  var MASLinks = document.querySelectorAll('a[data-mac-app-store]')
  for (var MASLinkIndex = 0; MASLinkIndex < MASLinks.length; MASLinkIndex++) {
    var MASLink = MASLinks[MASLinkIndex]
    MASLink.setAttribute('href', MASLink.getAttribute('href').replace(/^http/, 'macappstore'))
  }
}