Someone uninstalled the extension from my machine and now I can not find it on the chrome webstore. Is it removed from there?
For the moment, yes. I am waiting for updates for it as well as some of my friends are interested to run it. At least when the mainnet comes.
Yes, if I'm not mistaken, as per info on their telegram channel
https://t.me/dusknetwork/ - DUSK devs temporarily removed the chrome extension as they've already attained quite a significant number of users required to test its implementation but rest assured, they will release a final product to it maybe alongside with its mainnet release.