Video Loading times

Is there any reason why videos load/buffer slower in Firefox based browsers in P̶i̶r̶a̶t̶e̶ ̶s̶i̶t̶e̶s̶ compared to chromium based browsers. I tested the same video on the same PC on Firefox and brave. I found that the video loaded better and quicker in brave as compared to firefox which was stuck loading every 20 sec to ~1min. If this is a problem with firefox are there any ways to fix/improve it?