The first bookmarklet turns off autosave for the current record, and refreshes the form without saving. Drag the below to your favorites bar.

javascript:(function(){var%20contentPanels=Array.from(document.querySelectorAll('iframe')).filter(function(d){return%20d.style.visibility!=='hidden'});if(contentPanels&&contentPanels.length>0){var%20Xrm=contentPanels[0].contentWindow.Xrm;Xrm.Page.data.refresh(false).then(function(){Xrm.Page.data.entity.addOnSave(function(econtext){var%20eventArgs=econtext.getEventArgs();if(eventArgs.getSaveMode()===70||eventArgs.getSaveMode()===2){eventArgs.preventDefault();}});alert('Form%20refreshed%20without%20save.%20Autosave%20turned%20off.');},function(errorCode,message){alert(message);});}else{alert('Entity%20form%20not%20detected');}})();void%200;

Below the unminified source.

(function () {
	var contentPanels = Array.from(document.querySelectorAll('iframe')).filter(function (d) {
			return d.style.visibility !== 'hidden'
		});
	if (contentPanels && contentPanels.length > 0) {
		var Xrm = contentPanels[0].contentWindow.Xrm;
		Xrm.Page.data.refresh(false).then(function () {
			Xrm.Page.data.entity.addOnSave(function (econtext) {
				var eventArgs = econtext.getEventArgs();
				if (eventArgs.getSaveMode() === 70 || eventArgs.getSaveMode() === 2) {
					eventArgs.preventDefault();
				}
			});
			alert('Form refreshed without save. Autosave turned off.');
		}, function (errorCode, message) {
			alert(message);
		});
	} else {
		alert('Entity form not detected');
	}
})();

The second bookmarklet open the selected lookup in a new window. Starting from CRM2015 every link you click inside a record form, opens in the same window. This can be annoying sometimes. To use this bookmarklet, you’ll just have to select the lookup on the record and execute the bookmarklet. This will open the lookup record in a new window. Below is the bookmarklet.

javascript:(function(){var%20contentPanels=Array.from(document.querySelectorAll('iframe')).filter(function(d){return%20d.style.visibility!=='hidden'});if(contentPanels&&contentPanels.length>0){var%20Xrm=contentPanels[0].contentWindow.Xrm;var%20currentControl=Xrm.Page.ui.getCurrentControl();if(currentControl.getControlType()==='lookup'){var%20currentLookup=currentControl.getAttribute().getValue();if(currentLookup){var%20entityName=currentLookup[0].type,entityId=currentLookup[0].id;var%20url=Xrm.Page.context.getClientUrl()+'/main.aspx?etc='+entityName+'&id='+entityId+'&newWindow=true&pagetype=entityrecord';window.open(url,'_blank');}}else{alert('The%20currently%20selected%20control%20is%20not%20a%20lookup');}}else{alert('Entity%20form%20not%20detected');}})();void%200;

This is the unminified source.

(function () {
	var contentPanels = Array.from(document.querySelectorAll('iframe')).filter(function (d) {
			return d.style.visibility !== 'hidden'
		});
	if (contentPanels && contentPanels.length > 0) {
		var Xrm = contentPanels[0].contentWindow.Xrm;
		var currentControl = Xrm.Page.ui.getCurrentControl();
		if (currentControl.getControlType() === 'lookup') {
			var currentLookup = currentControl.getAttribute().getValue();
			if (currentLookup) {
				var entityName = currentLookup[0].type,
				entityId = currentLookup[0].id;
				var url = Xrm.Page.context.getClientUrl() + '/main.aspx?etc=' + entityName + '&id=' + entityId + '&newWindow=true&pagetype=entityrecord';
				window.open(url, '_blank');
			}
		} else {
			alert('The currently selected control is not a lookup');
		}
	} else {
		alert('Entity form not detected');
	}
})();

References:

https://msdn.microsoft.com/en-us/library/gg509060.aspx