These fireworks may not last long, but they probably are the best ones in terms of taking pictures and videos with the Tokyo skyline and the Rainbow Bridge in the background (hence the name Rainbow Fireworks)..
These fireworks take place every Saturday in December (the closer to the year end, the more crowded).
The best view is probably from the front of the Decks shopping center.
via Tokyo’s Festivals:
Tokyo’s Festivals presents an overview on Tokyo’s great festivals (mostly free festivals about food, culture, fireworks and music), so that more people find out about Tokyo’s best events. If you are interested in festivals in Tokyo, feel free to visit and like their page (Link: fb.com/TokyosFestivals) and follow their instagram (Link: instagram.com/tokyosfestivals).