Capital One has "Eno"(https://www.capitalone.com/applications/eno/) which provides virtual cards and still works. I'm not a huge fan of Capital One, but afaik they are the only credit card company that offers this.
I should note that Privacy.com provides this service as well and I really do like their mission, but they have the limitation of only being able to be used with a debit card backing the account and I've also ran into some issues with their cards not working with some online vendors.
Capital One also has a browser extensions for this, including Firefox. Every time I come to a payment form on a website, it pops up and asks if I want to search for existing card numbers that match this site. If it finds one it will automatically populate the fields or ask to generate a new card, and then automatically populate the fields. I use it for everything.
I should note that Privacy.com provides this service as well and I really do like their mission, but they have the limitation of only being able to be used with a debit card backing the account and I've also ran into some issues with their cards not working with some online vendors.