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Not sure why this is happening or why the ./firefox command keeps repeating...

http://freedomsct2bsqtn.onion/fdwycmkknkayxmpanvvm/OTtAmNDT.png

$uname -a

Linux 4.4.0-47-generic #68-Ubuntu SMP UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$lsb_release -a

No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.1 LTS Release: 16.04 Codename: xenial

1

These are threads, this is normal.

They're not multiple instances of firefox but instead a single instance that has multiple threads created for it. This may be more apparent if you press F5 to view it as a tree, you will see a main firefox instance with multiple children.

When a process wants to run tasks in parallel it will often create a new thread. The thread will run the task while in the background, each of these threads will appear as a "new" process while in fact they maintain (most) of the same process space as the initial process.

See: Thread (Computing).

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