Chrome extension which reloads all unpacked extensions on opening of a url, for use with gruntjs's watch task.

background.js

/*
 * Use with grunt-exec command: 'open -a "/Applications/Google Chrome.app" file://localhost/reload'
 */
chrome.webRequest.onBeforeRequest.addListener(hook, {urls: ['file://localhost/reload*']});

function hook(details) {
	console.log('reloading all dev extensions');
	chrome.management.getAll(function(extensions){
		for(var i in extensions){
			extension = extensions[i];
			if (extension.installType == "development" && extension.enabled && extension.name != "Reload Extension") {
				chrome.management.setEnabled(extension.id, false, function(){
					chrome.management.setEnabled(extension.id, true);
				});
			}
		}
	});
	chrome.tabs.remove(details.tabId);
}

manifest.json

{
  "name": "Reload Extension",
  "version": "1",
  "description": "Reload chrome extension",
  "permissions": ["management", "tabs", "webRequest", "file://localhost/reload*"],
  "background": {"scripts":["background.js"]},
  "manifest_version": 2
}

Fixed missing .id for reenabling the extension.