KeePassHttp-Connector is a WebExtension for browsers to send and receive credentials from KeePass(XC). This is a port of the ChromeIPass extension for Chrome, but compatible with Firefox 55+. Note: Because Firefox does not offer an API to communicate with the built-in password manager KeePassHTTP-Connector needs to implement its own kind of password manager. Features:

secure integration with KeePass using the KeePassHttp plugin
receive credentials from KeePass
send new and updated entries to KeePass
support multiple KeePass databases
- select a unique icon for every database
contains a password generator which works together with KeePass
support multiple credentials for one page
- select from popup
- select from autocomplete
support autocomplete for username fields
support HTTP Auth requests (also known as htaccess-login)
support additional field values via String Fields in KeePass
support fill-in for dropdown menus (only for String Field values)
accessible via context-menu of input fields
accessible via shortcuts
automatically detect field combinations of username + password
automated password form fill if only one login combination is available
choose own credential fields for every page
checks for update of KeePassHttp

How to install: Installation Instructions