Youtube is a wonderful source of information on just about any topic in the universe you could desire. For example, see this article on solar cells:
How Scientists Achieved 39.7% Efficiency
The problem is the huge number of ads that can render a video unusable.
If you are using Firefox, the best ad blocker I have found is Adblock Plus. It is faster and uses less memory than other versions. It kills all ads except the ones that are part of the video. I just skip over them.
You can download Adblock Plus at
The next problem is the muffled sound in Youtube videos. Frequencies above
500Hz need to be boosted by about 12 dB for a clear and natural sound. An excellent product is Audio Equalizer atNeither of these add-ons seem to be othered by which version of Firefox you are using. I am using FF 52.0.2 and both work fine.