I just finished a side project where I was using a managed postgres instances. I originally was going to use gcp because that's where my application's hosted. However, after starting a postgres instances and it idling for a couple weeks I saw that it was going to cost me $30 a month... just to sit there. I ended up going with a different vendor for managed SQL. After playing with that for some time, I was just thinking of hosting my db on my own hardware because I still don't like the price point.
I can appreciate having flat rate plans because you know exactly what you're going to pay. Especially for something like side projects.
I've been using FF as my default browser on desktop and mobile for at least 4 years. I've had zero issues. In fact, if I need to use their dev tools, I find them superior to chrome. I don't understand the shade Mozilla gets thrown at them.