> Firefox is basically unusable on a 2Gb system <...>
I just had a look at one of the largest laptop retailers in the UK, and they don't sell laptops with less than 4GB anymore. Checking the steam survey [0] (which is biased towards gamers but still a very representative sample of PC owners and users), almost 95% of people have more than 4GB. Realistically, 2GB and even 4GB devices are at the absolute bottom end of devices that are in use in desktop computing.
Mobile is a different beast, but android has a specific lightweight OS for 2GB devices, and 4GB devices are budget at this stage. 6GB is the requirement for full-fat android. [1]
You may or may not agree that it's necessary, but the reality is that 2GB device are bordering on obsolete in 2022.
> One of the solutions could be to freeze and compress background tabs.
Firefox supports this already [2]
[0] https://store.steampowered.com/hwsurvey/Steam-Hardware-Softw...
[1] https://www.xda-developers.com/android-12-performance-class/
[2] https://support.mozilla.org/en-US/kb/unload-inactive-tabs-sa...