Wobbly windows:
1 of 3: install:
Terminal > $ sudo apt-get install compiz-plugins-extra > Enter >
2 of 3: control centre:
Linux Mint > Panel > Menu > Control Centre > Look and Feel > CompizConfig Settings Manager > Effects > tick Wobbly Windows > Close >
3 of 3: startup applications:
Linux Mint > Panel > Menu > Control Centre > Personal > Startup Applications > Startup Programs > Add > Name: Compiz > Command: compiz --replace > Comment: Run Compiz at startup > Save > Close > Reboot > test.