Useful (Web-)Devtools you might be happy to know about :)

So, a YouTuber I am watching from time to time has made a video about his (Web-)Devtools, so I thought why not share the video…and the tl;dr some viewer thankfully made as top comment :smiley:
If you can recommend any devtools please let us know :slight_smile: I will also try to think of some, once I’m done.