Adding something on top of this, it’s not officially supported, but this is possible at the moment.
If you remove the “.” and use the site function like this: <keyword> site:<tld> then it will do a keyword search across that TLD i.e. Paris site:fr - Mojeek Search
As it’s not something we’ve worked on specifically, it has some quirks. One of these is that using this will result in site clustering to be disabled, so you might end up with a large quantity populated from the same website.
An example of this clustering affecting things can be seen in this set of results: mojeek site:fr - Mojeek Search where you have to go through a fair few pages to find a non mojeek.fr result.