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

Can't log in to this with Firefox Android. Multiple problems. So I uninstalled it and now it won't reinstall at all. Junk.

Stopped working. Really poor manager--unreliable. Stay away!!

Constantly logs me out, regardless of settings. Doesn't work on many sites, even sites where it used to work. Vault screen does not occupy the full browser screen. In general difficult to use and getting worse.

I wish LastPass had templates and direct functionality with iOS apps, but that might be impossible given how tightliy controlled Apple is with system api

Раньше работал,сейчас значок оранжевый и не открывает пароли...!!!херня!

Every time Mozilla update their browser this year I lose LastPass and therefore all my passwords and then have nothing but trouble re-instating it. Now looking elsewhere

I would go NuTz if I didn't have Lastpass. My professional and personal accounts exceed 250 in number!
Imagine memorizing 250+ usernames and passwords!? This software is a Godsend. I was going to dock Lastpass 1/2 of a star, but I have a feeling that the few credential spaces it fails to fill in are because they are being actively blocked with javascript by organizations like Wells Fargo and American Express. I went with the premium service. For a service this good, they should be paid something for it.
Update:
I've had to contact support a few times for issues with multifactorial authentication and adjustments for my VPN. They always respond quickly and are very helpful.

We love you

It simply is not working on my machine.

I like it. I can't do without it!
Thank you to the development company!

Невозможео войти в дополнение, если настроена мультифакторная авторизация.
Раньше работало

Not always reliable, ambiguous instructions. For example: "matching logins". Does that mean to do something?

I really liked LastPass. Started using it almost 2 months ago. In the last few days the Firefox extension auto-updated to some non-functional version and instead of menu dropping down from the icon in the toolbar, it only shows a white triangle in the bar. I use Waterfox now on one PC and have the same happening. I uninstall the extension, go back to LastPass website and install again and it works fine until next auto-update happens.
Fix this! If it is incompatible with some Firefox version, don't push it to install!

On Firefox 59.0.2, right-click to copy password doesn't work. It works when I use the lastpass.com web site, so what's the point of even having this extension if I don't use it to auto-login to web sites?

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`.