Tor browser on tails for clearnet and darknet browsing

I'm pretty new and I've been reading the bible and searching tforum forums but I'm still a bit confused.

Can I browse darknet content and clearweb sites simultaneuously?

A) I'm thinking the never having mixed browser tabs in the same instance, and creating a new browser "identity" when switching from "safest" to less safe security and javascript levels seems resonably secure to me. Obviously never logging in to any clearweb sites you've ever logged into on a personal, unsecure device or browser.

B) If I keep TOR browsing security at the safest level can I feel reasonably safe having my darknet market on one tab and doing clearnet drug research in another considering that many sites won't work without javastcript? Would it change anything to have two browser instance open to separate the two?

C) I've also heard the best way is to shut down and restart tails completely between changing from darknet browsing to clearweb browsing.

Confused by part A. Don't log into clearnet accounts like tforum with tor on least safe etc. Cause... why? There's plenty of browsers for that. If you change the safety level of tor it always prompts you to restart iirc so just do that.

Part B: When running another window / tab (same thing) they are running under the same safety level. Do clearnet things on a clearnet browser. Why even use tor for that?

Part C: Why? tor makes your public IP near impossible to trace so what does it matter which website you visit as long as you don't log into clearnet accounts. What would a reboot do that the change identity function tor has wouldn't?

While writing this I'm on tforum on tor browser and in another window on my regular browser watching youtube doing other stuff on linux mint. I'm not doing anything illegal by browsing tforum. If you start to do questionable things then you should stick to Tails for sure.

OP is using Tails, which forces all traffic through Tor. There is no option to use a clearnet connection to browse clearnet sites.

Browser-level settings like disabling Javascript apply to every tab and window. You cannot have different settings per window or tab.

This might be able to work by leaving Javascript enabled in the browser, then using a browser extension like NoScript to disable scripts before loading on onion site. But it's really easy to make mistakes this way.

There's no benefit to restarting Tails to switch to clearnet browsing. Clearnet sites and onion sites do not work the same way. Only clearnet sites use Tor exit nodes.

Well you can go to a clearnet website but it will look broken af so yeah like you said. It's unusable.