Is there any way to save and import cities into the generator? My tab often crashes for me while I'm making a city and I have to restart several times. It would be great if I could save my progress so I wouldn't have to start all over again so much.

There is no real saving/restoring in MFCG. The closest thing to saving a city is copying its permalink (Generate > From URL or right in the address bar if it's the Arcana version). It doesn't save user's changes though - custom names, POIs, changes made with the Warp tool are not saved.