LastPass was giving me problems after the Firefox Quantum update. Every time I closed my browser and then re-opened, I would be logged out of LastPass. Sometimes while using the browser the LastPass icon would change from red to yellow or black and give me an error message about my internet connection. Here is what worked for me. I clicked the LastPass icon, logged in, and went to 'more options', then 'about LastPass'. That screen gave me the version number I was using and also the option to download the binary component. After downloading the binary component, LastPass has been working properly. Good Luck!
NEVER MIND THIS POST! SOMETIMES IT WORKS, MOST OF THE TIME IT DOESN'T!