Greasy Fork is available in English.
Turns off the ability to open new windows, opens tabs instead
< Feedback on No Pop-Ups, only new tabs
That's how things are made in websites.
Btw, you don't need this for FIrefox, it already has an option not to use new windows but only new tabs.
Charter
It doesn't work for charter email. Well, it half works. The email doesn't open in a new window, but it also doesn't open in a tab.