It's an over-simplification of Chinese idiom "浑水摸鱼", which is literally 'catching fish in muddy water'. Origninated from Thirty-Six Stratagems (三十六计). It generally mean "to take advantage of a chaotic situation or a crisis". It is later extended to express slacking off.
I'm using a [Gprinter GP-1324D](https://www.ebay.com/itm/365264659480) in everyday work, printing task tracking stickers, various labels, etc. It's designed to print shipping labels / recipients in business scenarios so it's fairly robust. The only con I can think of is its physical size. I'm not familiar with eBay, but on Xianyu(Chinese second hand market app), yes you can buy one using only $20, shipping included.
I’ve been using Firefox since the Quantum version is out. It feels slightly slower to Chrome but it's negligible to me. Otherwise I can't tell a difference (except some heavy web based Office like solutions screaming 'Your browser is not supported!' but actually works fine).