Click on app drawer and quickly press 2 things, home button and then quickly single press the screen dots icon(which shows home many homescreens you have) present above the app drawer icon.
It opens widgets. I'm sure it didn't exist when I had nexus 4 with 4.3, Works on nexus 5. I could record a screen recording to show what m talking about but there is no option for that in stock(correct me if m wrong). I used to do that all the time in cataclysm ROM easily with toggles.