Can I use a regular E26 LED bulb as a replacement for a refrigerator light bulb?
In theory, any LED bulb should work. There are bulbs designed specifically for refrigerator/freezer use like this one. The bulb you listed is a 60-watt equivalent, which might actually be too bright - due to glare you really don't want your refrigerator to have too much light as it can actually make it harder to see things, as counter-intuitive as that may seem. The bulb I linked to mentions vibration resistance, among other things. In theory, "appliance bulbs" in general should be a bit more "heavy duty" than regular bulbs.