Here is some info on what you're seeing.

Introducing Firefox’s new Site Isolation Security Architecture https://hacks.mozilla.org/2021/05/introducing-firefox-new-site-isolation-security-architecture/

You can try Firefox's Site Isolation feature Fission in Nightly now https://www.ghacks.net/2020/09/20/you-can-try-firefoxs-site-isolation-feature-fission-in-nightly-now/

Firefox's Project Fission: better security and more processes https://www.ghacks.net/2019/02/07/firefoxs-project-fission-better-security-and-more-processes/

Thanks but what I'm asking is are all these processes normal?

Hey, As inferred by jonz4Se, Firefox has multiple processes running, so to answer your question, yes it is normal to have these multiple instances running as long as they are not taking too much RAM or causing your computer to freeze in certain occasions. Hope this answers your question.

You can find the current multi-process state on the Troubleshooting Information page (about:support).

• "Help -> Troubleshooting Information"
  "Application Basics":<be>Multiprocess Windows and Fission Windows
  "Remote Processes" (Web Content)

You can check the about:memory and about:processes pages for info about all processes. See also the about:unloads page for info about the tabs.

• you can open "about:" pages via the location/address bar
  this "about:" protocol is used to access special pages