This morning Firefox put out a update, after I installed it, Lastpass started working again thru the Add On. For the last 5 days it had not worked. I dont know if it was a Lastpass update or a Firefox update, but this has happened in the past too. I love the security of it and Ive used it for years. BUT they really should test out the Add On before they release it.

I've used the paid version of this app since 2017. It's now pretty much flawless.

No funciona bien con aplicaciones que tienen pop-up login.
No siempre está activa la aplicación.
En general es una buena aplicación pero cuesta activarla.

The app is buggy. After Sept. 16 2020 update I cannot log into the app on my PC, have to use a one time password half the time

After having a lot of issues I have found it is related to having Firefox not remember my history, this seemed to have cause the extension not to accept master password.
Now working as it has for the past 5years, still my favorite, down voted due to the Firfox issue.

Depuis un mois, et suite à une nouvelle version, j'ai une erreur quand j'essaye de me logger. C'est un problème récurrent qui apparait dans beaucoup de commentaires. Alors que ça arrive quelques jours, je peux comprendre. Mais ils laissent trainer ce bug pendant un mois c'est non et cela ne me donne plus trop confiance dans cette entreprise pour gérer mes mots de passe.

It will not let me log in! To get in, I had to use a one time computer generated pass, which required my master password which it wasn't taking to begin with.

I changed my password and got the same thing.
Big time waster.

If Firefox has the following settings, you will get an "An unknown error occurred" error when you try to log in to Lastpass.
History Firefox will Never Remember history

If Firefox has the following settings, you can log in without any error.
History Firefox will Remember history

Firefox 81.0
Lastpass 4.56.1.3

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I can now log in after updating to Lastpass version 4.57.2.5 (September 28, 2020).

No longer works with Firefox. They might want to outsource their QA before releasing updates.

Log in in browser always states unexplained error.