Works great, but the company's been promising Fingerprint auth on the "X" version for a while yet there's still no trace of it.

It disables the firefox password generator but does not provide a replacement password generator. It adds an "Show 1Password" button to the password field but the button does not work. Nothing happens. Big regret buying this service.

Edit: much happier now that I have managed to iron out some of the wrinkles. There are still some rough edges. My previous password manager was keepass and I really miss the auto-type keyboard macros for populating some of the more complex windows app logins like ASX Austraclear and some of the banking websites that ask for multiple pieces of information to login. I have come to quite a few change-password pages where 1Password does not generate a new password for me, and also does not provide an easy way to trigger the password generator, where I know the native firefox password generator had no problems. Also it does not pre-fill basic auth logins like the native firefox password manager does. There is a work around, but it is not intuitive.

I love 1Password and it is a great extension. The only complaint I have is no support for Touch ID on Mac

**Update: If you download the Firefox extension directly from 1Password you can use TouchID. Only caveat is that it requires the desktop app as well. But it makes life much easier for me.

I've been using 1password now for years and always worked very well for me.
Customer support is really helpful and there may be some features that aren't supported, but thats perfectly fine, since not every possible feature can be put in 1 solution.
However, I still can't give it the full range of 5 stars, since there are some annoyances with this extension that should be easily solvable.
The most prominent for me is the lack of a CAPS-lock indication in the login box, so I keep inputting the password wrongly on my laptop (which has no visible CAPS-lock indicator anywhere on the device) when the CAPS-lock is activated by accident.

(For example, I can detect it within an extension using:
var CapsLockState = false;
document.addEventListener("keyup", function(event) {
CapsLockState = event.getModifierState("CapsLock");
console.log("keyup", CapsLockState);
});
)

I would love to edit items in the addon and not have to open another page. But otherwise 100% excellent addon.

Attractive and well designed. Easy to use and feels stable.

Would be 5 stars but it doesn't link with the desktop app in Windows like the old extension. If you use 1Password just for the web, this is the way to go.