alternatively if you dislike addons you can try this:
-load the page but
do not click play on the video yet or you will have to refresh the page
-select desired resolution on the video settings
-rightclick, inspect element in an open area on the page, not on the video player
-click network tab
-click the media filter
-click play on the video
-rightclick and open in new tab the media that appears to be loading the most data
View attachment 534471
from there the video should load in its own tab and you can download it from the bottom right or rightclick save video as
a good majority of streaming sites allow you to do this but sites like pornhub you have to dig into the page source and find the video file url