Forum zgromaźeństwa Firefox

This will be a long question and in 2 parts, so I'll apologize up front.

1. I am running FireFox on my 11-year old MacBook and love it (MacOS Mojave version 10.14.6). However, my printer just crapped out, and my new HP 9120e requires MacOS Big Sur (11.x.x) or later. If I update to that OS, will I still be able to use FireFox? If so, where do I find it (see Question 2, below)?

2. Since my old MacBook is clearly reaching the end of it's life and my Excel and Word apps are also ancient, I am trying to transfer all my stuff onto a "New" MacBook that is running MacOS Monterey version 12.0.1. However, the "New" computer (I will not say "improved") has been a reliability nightmare and I just had it in for service. They wiped my disk clean to install the Monterey OS. So, other than Safari, I have no browser (or anything else for that matter). When I go to the App Store to download FireFox, and don't see it anywhere. Help!

If my Firefox is synced between my Mac and my Android, should I be able to see open tabs on my Mac on my phone too? Currently I do not. At least not all the open tabs. And I do have that checked in "what to sync".

On my Mac I have 8 tabs 'pinned' and 11 open. On my phone when I look at the synced tabs only the 8 pinned tabs show up.

How can I see all of them?