Very good app, no ads and very trustworthy

When it works it's lovely, but it simply isn't as reliable as Bitwarden. Sometimes it won't spot a login field, sometimes it will fill in the password but not the username, and sometimes it will fill in the password wrong even though the copy in the vault is accurate and works when manually copy & pasted.

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Proton is the best, just use it bro

Absolutly excellent! I feel secure with all proton tools.

Really useful addon

"When it works, it really works. When it doesn't work, it really doesn't work."

In my end, this add-on wasn't even remotely nice to use, it does everything what it says, and it does it beautifully. But because of one critical, persistent issue, troubleshooting this add-on was a literal saga filled with confusion and torment.
The issue is that it sometimes kicks me out of my session and just refuses to sign me back in and turns into a loop where I input my email address and password over and over again only to end up with an error every single time. I used different forks of Firefox and it still did the same thing, re-installing the add-on or using different Firefox profiles didn't fixed anything, forcing me to use the Web App or Windows program of Proton Pass. I don't know if it's because of my setup or the extension... Either way, this is not the normal behaviour you would expect from this add-on.