This script toggles the Snap Vector Tools and Transforms to Pixel Grid setting in Edit » Preferences » General (or Edit » Preferences » Tools, in Photoshop CC 2015 and higher).
Download
To download this script, right-click (Ctrl-click on the Mac) on the appropriate version below, and choose "Save Target As".
Toggle Pixel Grid Snapping
Version: 0.2.1 (August 1, 2016)
Requires: Photoshop CS6, CC, or CC 2014
Downloads:
ZIP
Enable/Disable Pixel Grid Snapping
Version: 0.2.2 (August 15, 2016)
Requires: Photoshop CC 2015+
Downloads:
ZIP
Installation
Download the script(s), and copy it into your "Adobe Photoshop ##/Presets/Scripts" folder.
After restarting Photoshop, the script should appear in the menu.
For more detailed instructions, see the Installing Scripts section of the Scripting Photoshop, Part 1 tutorial.
Tip: Did you know that you can use the command (Ctrl/Cmd+Alt/Opt+Shift+K) to assign keyboard shortcuts to your scripts? You can also record scripts within actions and then assign function keys to the actions.