Is Bitwarden responsible for slowing down the web browser?

I have noticed that when Bitwarden is installed, the web browser (Firefox) seems slower and much less responsive.

A great example of this issue is on the popular (and useful) Johns Hopkins COVID-19 CSSE dashboard site:

With Bitwarden installed, that site is barely usable and very slow to respond. Without Bitwarden installed, it works well.

I took a look at about:performance in a Firefox profile with many browser extensions installed, and Bitwarden is, by far, using the most energy (CPU resources) when that page is opened.

Can anyone confirm this? Can this be improved?