Firstly: Firefox can import your Chrome passwords and if you enable/sign up for Firefox Sync (which is better--privacy wise--than your Google account) you'll be able to use them with Firefox mobile (it'll sync your settings and bookmarks too, obviously).
Secondly: You can export your logins from Chrome to a .csv file (hamburger menu in the settings... somewhere; I forget, sorry) which can also be imported into Firefox (https://support.mozilla.org/en-US/kb/import-login-data-file) and other password managers. I literally just tested importing both Chrome's and Firefox's saved logins into a KeePassXC database and it worked fine (it didn't automatically figure out which field was what though so I had to manually tell it which column was the password, URL, etc but no big).
Firefox also has the same .csv password export feature BTW.