There’s a Firefox addon by Mozilla called “Container Tabs”, it allows you to make seperate “containers” for tabs, allowing you to seperate shopping, social media, etc. There are also 3rd party extensions to make specific containers for Google, Amazon, Facebook, and so on. It’s very useful for separating your online life whilst maintaining one browser!

Edit: also, you can set a color for different containers and it shows that color in a thin bar at the top of the tab, which shows on all tabs. Non-container’d tabs don’t have a bar at all.