Google Chrome had this on Android several years ago, but it was quickly yanked out—probably because people hated it as it felt like ti bogged down the OS with it. Personally, it felt like information overload forced into a limited UX context.
But now with advancements like tab unloading/discarding and faster CPUs, it might work for some people om mobile devices. Desktop browsers though might still be hampered by limited task/context-switching options.
Somewhat OT, but tangentially related: One of my clients likes to tell me his work requirements by telling me long-winded stories about how he came up with an idea, what exactly happened, etc. that was useful at first but became extremely wasteful of time as years passed. I tried typing down notes while he talked, but it became too hard to write useful ones.
At some point, I resorted to keeping an audio recording of the whole meeting just to make sure I have something to come back to, in case my notes fail me.
I wouldn't do this for everything, but it helped me realize that an audio/video log like a dashcam video can work for certain scenarios.