Lastpass has been my password manager for a decade at least and I trust it, and continue to use it. However I have now found that the browser plugin for Firefox reduces performance of the browser by 50%. You can check for yourself by running a benchmark like the Speedometer2.0 suite (see the URL below). Run it with and without the plugin enabled and judge for yourself. If this is fixed I will update the review.

https://browserbench.org/Speedometer2.0/