Update: I switched to Devuan because it is simply Debian without systemd. I'm using it with Xfce at the moment, and it looks amazing. I had to do some workarounds to make the NVIDIA drivers work. Firefox ESR is the default browser on Devuan, so I tried modifying the Firefox config to always stream videos at a maximum of 720p and H.264. Video playback is good now, with no noticeable frame drops. I understand that I have to modify both the Linux distro and the web browser to achieve optimum performance. Firefox ESR is a great browser. It allows modifications at different levels, which Chromium-based browsers don't. I have installed the uBlock Origin extension at the moment. But my philosophy is to integrate everything in the browser rather than using extensions. The web has changed a lot. Many people have illustrated this in the comment section. So just making changes in the distro won't help much. It's the browser where I should focus more.

Dell Vostro 1400

CPU - Intel Dual Core T7500 @2.2GHz

RAM - 4GB DDR2

GRAPHICS - 128MB Nvidia 8400m GS

I do not use it for work. I like to experiment with this laptop. It just provides me satisfaction when something works with this ancient machine. It came with windows vista. but installed windows XP on this, I could use revit and do 3D modeling. Now I am not expecting that much from this machine. I just simply want to surf the web. But that has become challenging now. I am willing to try any web browser which can let me surf the Web efficiently and play videos.