Been using it for years, but recent changes to both LastPass and Firefox have brought about problems and missing functionality. To add insult to injury, my reward for being a supporter of the Premium version is having the price DOUBLED while the performance has degraded significantly.

Some users may not use features which are currently broken:

* It will not open my list of sites by clicking the LastPass icon in the browser extension in a Private Firefox window
* Attachments stored in Secure Notes will not open
* Many users report the inability to use copy & paste for usernames/passwords

24-Nov-2017 update: The binary component, used for opening secure note attachments, has been repaired, restoring this functionality. But the extension still doesn't work properly in a private browser window in Firefox Quantum.