Reopen more than one instance of Firefox

[BoomerFNG]

I'm a very heavy user of Firefox on a laptop, with a second Monitor connected, as I work on it almost every day.  I keep about 15 Tabs Pinned as these are constantly being used.  Being able to drag a pinned Tab to my 2nd monitor - and back again - is a great feature. 👍👍👍
However...  I had to close Firefox and re-open it.  Unfortunately I had a 2nd instance of FF still open on the 2nd monitor, and only closed the main FF on my Laptop - so on restart of FF,  I only had the 2nd instance of FF open up.  So... I had to "rebuild" all my Pinned Tabs plus other tabs I'd been working with from the 1st (Main) instance of FF.  ☹️

I would hugely appreciate if,  on closing FF with 2 instances open,  on restart FF would open BOTH instances. 🙏

[Jon]

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