Works great, but I cannot give it 5 stars. I am not signed in into 1password on my work computer and every time I open Firefox, I get the "Welcome to 1Password" tab. It is very, very annoying.

Very nice extension, but unfortunately not there yet.
Using extension on linux. Unable to select and delete mutiple contacts, unable to edit contact.
Sometimes my cpu usage gets 100% when submitting a form and I have to close browser or disable the extension to free my cpu - definitely a problem of 1Password X, when it is disabled, form submit proceeds ok.

It pales in comparison to the 1Password + Desktop app combo. I find it often doesn't sync right away; sometimes it doesn't sync for minutes at a time. The auto-fill is also very hit-or-miss. A specific recent example: when trying to login on xbox.com, the auto-fill popup appeared, I told it to auto-fill, and then? Nothing.

Sometimes there is a delay with the auto-fill (usually upwards for 3-5 seconds). This time it just never happened, so I had to use the Desktop App plugin to do it instead.

It's frustrating because I often need to switch between a Mac and Linux environment, and 1PasswordX is the only product supported on Linux (please make a desktop app).

The only reason for using this one is if you're sad enough to use linux and still try to have 1password.
Otherwise the usual plugin + hostOS installation is much better.
There're many functionalities that will require you to switch to the host app anyway, it's very annoying that this (and the web version) of 1 password lack so many features.

When it works it's great. Every now and then I cannot open the extension to unlock 1password. Given that I'm using this from Linux, it means I'm completely boned.