Question 1 firefox tab, 13 firefox processes shows in task manager

[Weathered]

When I have firefox open lets say just 1 tab, task manager will show 13 processes. If I have 5 firefox tabs open, task manager will show 22. Or am I not reading task manager correctly?

In the screenshot posted, I have 5 tabs open.

https://imgur.com/XWJxQ6a

View: https://imgur.com/XWJxQ6a

 

[USAFRet]

In the screenshot posted, I have 5 tabs open.

And how many have you recently closed?

The ones marked as 'Efficiency' are using no CPU, just RAM.
Held in RAM, in case you decide to reopen them.

 

[Math Geek]

It's mainly due to the security sandboxing of various elements. Each tab gets it's own process, session cookies can get their own, loading a video isolates it into its own and so on and so on. Keeping each element separate decreases the chance one thing can infect and take over other things.

 

[zinkles]

When I have firefox open lets say just 1 tab, task manager will show 13 processes. If I have 5 firefox tabs open, task manager will show 22. Or am I not reading task manager correctly?

You can see your 5 tabs, as the ones using the most ram (100mb+) and the rest are essential components for the browser to run smoothly.
there are other processes which contain extensions, browser assets, etc.