KeePassHttp-Connector by Andy Brandt

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