NOTE: I found a fix for this Firefox problem!!!!

Original message:

I am yet another person whose Lastpass addon for Firefox stopped working on May 4, 2019. It has been removed from add-ons. When I try "+ Add To Firefox" again, I get the message "Download failed, check your connection".

Also, if I download lastpass_password_manager-4.27.2.10-fx.xpi and try to manually install it, Firefox says that the xpi file is "corrupt".

I am on my way to the lastpass site to also report this to them.

UPDATE: I found a fix. See this post within the LastPass forum! ...

https://forums.lastpass.com/viewtopic.php?f=14&t=331365#p1110235