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);
});
)

Does not support the 1Password Mac app, which is better than the Web App. I can't seem to unlock the extension or web app via my Apple watch.The only thing keeping me from switching is the App serial support.

It's been an extremely frustrating first two days with 1Password in general and much of the issue is these browser extensions. Unable to figure out how to change my original (weak) passwords using 1Password on my phone I figured I do it on my laptop. But neither Chrome nor FIrefox extensions work...well, worked once or twice but not the last, oh, 15 or so times I've tried. And I've tried changing passwords on a variety of sites, uninstalled/reinstalled the addons a few times, rebooted, etc. Not sure I'll be a 1Password customer by the end of the trial period...

Love it! I have been a 1password user for years.

The latest version hugely improved performances
A must have! Awesome extension.

I've been a user of 1Password for close to a decade now. I was so happy that they made 1Password X for Firefox. I had previously used their browser extensions on Mac and Windows and I knew the integration is stellar. 1Password X did not disappoint. It helps me create unique, strong passwords for every site, auto-fills my credentials upon asking me (without any significant number of false positives, which is exceptionally rare among password managers) and even handles the 6-digit TOTP TFA codes for me. When I had a technical question about the encryption used its developers were more than happy to address it than waving me off or giving me a market-drone reply. That was impressive and what truly sold me; you get to talk to the developers if you have a problem, not some script-reading, underpaid kid packed in a sardine can sized cube halfway across the world. But I digress. The features of 1Password X are well worth the small annual fee, especially if you go for their family plan.

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