why does my phone keep telling me I've reached my tab limit and I can't open anything else

Everytime I try to open something that says I've reached my tab limit and I have to close all my tabs

Everytime I try to open a new tab it says I've reached my limit and I need to know how to fix it

Everytime I try to open something it says I've exceeded my tab limit and I don't know how to fix it

Note that asking once is enough.