I've been using this for about 4 years on both mobile, and desktop. It is hands down the best app I have. Some people say that they have some UX issues, for some websites that don't have accessible forms, I just paste the numbers manually. I love the functionality to limit the monthly spend per card and it has a very reasonable free tier... which I appreciate. I have never had any issues with the plugin being intrusive or constantly opening up pages, as other users have stated. A lot of the reviews here are concerning privacy... but of course you will have to allow the extension to see what you have on screen for it to autofill the card information. I have a separate Gecko based browser so that I can use extensions like this.