Did you check with Last Pass for updates?

I went to the Last Pass site, but there is plainly marked update button. It is my understanding that this is an extension of Mozilla and something that Mozilla makes work. I may be wrong. I will try support at Last Pass.

I think It is all good. The icon has reappeared. I had the update button at Last Pass on. I did reboot browser and things reappeared. Thanks for help.

katberg said

It is my understanding that this is an extension of Mozilla and something that Mozilla makes work.

The LastPass Password Manager is not made or maintained by Mozilla as it is made by https://www.lastpass.com/

The vast majority of Extensions being hosted on addons.mozilla.org is made by a third-party author or company.

While it is a third-party Extension for Firefox, you are still welcome to ask for help about here in case some other user knew the answer or can find possible fixes or such.