Opening two tor browsers with different security levels

I want to use tor browser on the safest security level whenever possible. This is because I want to reduce my browser fingerprint. It is also because I want to prevent my computer from being attacked by malware distributed via advertisements specifically designed to attack / deanonymize people who are using tor / whonix.

However, the whonix forums requires me to use javascript in order for it to function properly. This means I have to use the safer security level in order to use the forums. But when doing this and engaging in self support to try and solve an issue, it is easy to end up going to a search engine or another website on the safer security level instead of the safest security level. If I try to open up a second browser and change the security level of that browser to the safest security level, it also changes the security level of the browser in which the whonix forums are displayed.

How can I fix this? Do I need to use multiple whonix workstation in order to have a tor browser with the safer security level and a tor browser with the safest security level open simultaneously? Or is there another way to stay safe?

You can whitelist sites temporarily using NoScript.

See the last paragraph:

Consider Qubes-Whonix.

See:
Multiple Tor Browser Instances and Workstations