Shooting fireworks with an Olympus OM-D E-M1 II sure is easy.
In the past I had always shot fireworks either using the bulb setting or long exposures of 4 to 10 seconds (using a tripod, of course.)
My Olympus cameras have the bulb setting, but also a “Livetime” setting. It works similar to bulb. I push the shutter release once to start the exposure and a second time to end the exposure. But with the added advantage of being able to see the image in progress on the LCD screen as the image is being recorded. So I can see when I have a desirable amount of bursts in the frame as it is being recorded.
I would love to try that feature with a larger fireworks display, preferably one where the bursts are all over the sky, not just concentrated in one spot.