Sometimes colours can be hard to read against Wallpapers like this one. Appearance > Style takes a while to scroll through all the Mint-X and Mint-Y options until I get to what I want.
So I did a quick bash script so I can quickly change the Text to a contrasting colour, or to a style that does away with Transparency, but still looks decent on my GTK stuff like Firefox, LibreOffice and Thunar. The GUI doesn't close until I click the Quit button, so I can immediately swap to a suitable theme just for work in one App, then back again.

Wallpaper is from NASA's Jimmy Webb telescope.