My favorite add-on
But depends on the abandoned KeePassHttp project (last update on github 8 years) (-2 stars)
Would it be possible to switch to another KeePass plugin, e.g. KeePassRest?

KeePassHelper asks permanent for "new Key Association", association wouldn´t work. Anymore.

Reregistrion fails. One has to remove and reintall the plugin to work with Keepass

Does not indentify the field automatically

The biggest drawback -- can't start from a right-button menu.
In some cases, when toolbar is not shown (for example... login into some service (feedly for ex) using google account, can't input credentials.
Procedure of assigning keyboard shortcuts is unclear: looks like it doesn't work without the modal window shown.

But it lacks the best feature about connecting to keepass, bidirectional communication with it.

There's no point in a keepass extension that only READS from keepass, we need to generate passwords and save them in keepass for this to really work.

For some website, the windows is too large.
It cannot be used for intranet login