KeePassHelper Password Manager by Joe Ertaba

KeePass/MacPass Helper extension adds a toolbar button to your Firefox browser. Pressing the button brings a panel at the top center part of the currently selected page displaying all the matched credentials for this domain. You can either insert user-name or password or even both through the action buttons.

Note that make sure login or password input box is selected before opening the panel. Insertion occurs only if an input element is selected.

For more info please visit the FAQs page:
http://add0n.com/keepass-helper.html
For bug reports use:
https://github.com/belaviyo/keepass-macpass-helper/

--- Guide (from PassIFox extension; but modified)
Requirements:
* KeePass 2 -- http://keepass.info version 2.17 or newer
* KeePassHttp -- https://github.com/pfn/keepasshttp/ download at https://passifox.appspot.com/KeePassHttp.plgx

Directions:
1) Install KeePass
2) Install KeePassHttp by dropping KeePassHttp.plgx into the KeePass Program Files directory
2a) Log into KeePass
2b) Verify KeePassHttp has been installed correctly by checking Tools > Plugins
3) Navigate to any page containing a password
4) Click the toolbar button
5) Switch to the KeePass window and enter a descriptive name into the dialog that popped up and click save.
6) Your passwords are now securely retrieved from KeePass when the toolbar button is clicked

Note: As of version 0.3.1, the extension supports filling custom elements using "String Fields". See FAQ 12 for more info.
https://add0n.com/keepass-helper.html#faq12

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Please note that the FAQs page of KeePassHelper extension has Google Analytics code. For more info please visit Privacy & Policy section