I found 137,345 Chrome extensions and 39,263 themes – 176,608 items in total.

17 of them have been installed more than 10 million times.

70% of Chrome extensions have fewer than 100 users, but together they only make up less than 0.1% of installs.

The median install count is 17, on average each extension has 12,304 users.

I'm only including extensions with at least 10 ratings. The median overall rating is 4.4, the average is 4.1.

The ratio of installs to ratings is about 140, so 1000 installs will result in 7 ratings.

4.7% of extensions support some kind of payment, mostly as a one-off purchase rather than as a subscription.

In most categories 1-3% of extensions are paid. The Fun category is a clear outlier here, with 15% paid extensions

89% of one-off prices are $0.99.

The median subscription price is $4.99/mo, with an average of $8.35/mo.

71,557 different authors have published Chrome extensions. The top 24 have published 5% of all extensions.