Yesterday Google started showing an approximate number of installs in the Store. (Screenshot from https://chrome.google.com/webstore/detail/momentum/laookkfknpbbblfpciffpaejjkokdgca)

Approximate number of installs for Momentum chrome extension

Fortunately, we found a way to extract an exact number of installs. Unless Chrome eliminates this loophole, Extpose will show proper install numbers for all extensions as long as historical data. (Screenshot from https://extpose.com/ext/40626)

Extension profile for Momentum on Extpose
Momentum extension historial install count.