It's not just the change in UI philosophy, though: They've basically broken the product with the last release. Core functionality doesn't work anymore. It's meant to be a password manager, which means filling in forms with passwords. But now it either doesn't fill them in, or it fills in things it shouldn't. Awful. So disappointed after using this product for so long. Doesn't anyone test this stuff???
On Firefox you can roll back to 4.106, the latest functional version, at https://addons.mozilla.org/en-US/firefox/addon/lastpass-password-manager/versions/
On Chrome apparently you have to download the crx file from some unofficial repository, which is a very high security risk and it should be avoided.