Legrooms for Google Flights is a very helpful travel search extension that displays airport info, carry-on restrictions, and amenities alongside search results from Google Flights. 

The extension lets you see a list of legroom, carry-on baggage, and amenities for the itinerary you have selected. This can be used to browse for travel options and make informed decisions. It is possible to see the legroom and carry-on baggage for each segment of the itinerary, and you can compare the legroom of each option side by side.