Is there a Firefox browser extension that shows the size of the page being loaded?

Question

Mozilla Firefox

Greetings!
I'm interested in an extension for Firefox that would show the size of the open page, i.e. how many mb the page that it opened weighs, and ideally, if all this information is still shown in the visit history, how many mb were spent on a particular site per day /day/month.
Py.sy: At the expense of viewing the page size through the developer console in the course.

Answer 1

Shows only the size of each tab, did not check the accuracy.
Tab Memory Usage – https://addons.mozilla.org/en/firefox/addon/tab-me...