I've been using LastPass for years and it is great, but the extension for Firefox does not work as well as it does for Chrome. There is no quick way to copy a password into clipboard, and some actions are broken and lead to a blank page. The LastPass team really needs to look at fixing this extension for Firefox.

Lastpass is ok. If you are missing some features like the Copy Password button, you need to install via the installer from their web site. There is a binary component that is not included when you install from here. See:
https://lastpass.com/support.php?cmd=showfaq&id=826
https://lastpass.com/support.php?cmd=showfaq&id=5576

It's great in the fact that it stores my passwords securely and I don't need to remember them because it auto-fills them. However, I always need to fill in a security challenge which is a waste of 10 seconds everyday. The UI also isn't the best, but I can deal with it.

It's been working great so far, but the latest update has made Firefox (64-bit) act very laggy and even freezing the whole browser, especially when watching YouTube videos, like WTF!? fix this please since this was not an issue in the previous build version of this neat add-on that works like a charm and saves you a lot of hassle, so thanks! and keep up the good work.

Il m'est arrivé un mauvais tour. J'ai perdu l'accès à mon Smartphone et comme j'avais utilisé l'authentification à deux facteurs, je me suis retrouvé sans l'intégralité de mes mots de passes pour bon nombre d'applications et sites web. Vous devriez peut être développer la sécurité dans le sens de validation d'identité et non dans l'idée que personne puisse y accèder. Par exemple, pour moi qui ait eu des problèmes avec la peau de mes mains, j'utilisais mes empreintes pour déverrouiller mon Smartphone. Mais quand mes mains étaient rongées, mon Smartphone ne reconnaissait plus mes empreintes digitales. Je voudrais pouvoir malgré tout accéder à mon Smartphone même en cas de problème. C'est pareil pour Lastpass.

Была бы идеальная программа, если бы не ограничение пробного периода. Лучше бы сделать бесконечный бесплатный пробный период, но с лимитом на количество логинов. Но цены очень невысокие, как для почти идеального функционала! Рекомендую всем, кому не жалко небольших денег за безопасность. А кому жалко, есть опенсорсный бесплатный аналог (начинается на B, заканчивается на n).

I'm still confused how to copy the password from one browser to another

regarding FF ESR v52.7.3 , LastPass has been broken due to the update. Following @Iconoclast's advice resolved the issue for me on OSX with only restarting the browser. ie, remove the lastpass extension, restart browser, install lastpass extension from lastpass.com (not adddons.mozilla.org), disable updates in `about:addons`.

The update on 03/30/18 broke the Lastpass for Firefox extension if you are using Firefox ESR (Extended Support Release) which is a slightly older version of Firefox. The new extension update does work on the newest version of Firefox. TO FIX THIS PROBLEM: Go into your Firefox addons and remove the Firefox extension. Close Firefox and log out of Windows or restart the computer. Log back in, then start Firefox. Go to the LastPass web site and install the LastPass extension from there, It will know to install the older version of the extension that is still compatible with Firefox ESR and older versions. Then you can login and everything will be working. Go into your Firefox addons again, click on More then scroll to the bottom and turn the automatic update to OFF. You can check back in the Firefox forums to see when the problem gets fixed so you can know when to update the addon again. I gave the extension 4 stars because Firefox and LastPass have trouble getting along. Of course Firefox has trouble getting alone with pretty much all addons these days. When the LastPass extension is working it's awesome and I rely heavily on it and I'm a Premium Subscriber, but I am really sick of the problems Firefox has with addons as well as them taking away the ability to customize the UI. Anyway, I hope this helps you all! Peace.

Ich habe noch keine konkrete Meinung - später.

Love this app. pro user for almost a year. not perfect but always being improved. Thanks LastPass!