Previous work already addressed the performance issues of the Dashlane extension.
I can now pull out passwords, copy and paste, from Dashlane if I reach to the extension icon on the browser bar. This bug report is not about interactions with the Dashlane extension button on the browser bar.
It is the password auto-filling feature (in suitable value fields on a web page, a dashlane icon shows up offering to auto fill in the field if you click on it) never works. If I click on it, Dashlane acknowledges the input (changing icon from static to dynamic circling around) but then just hangs on, circling around. It never completes the auto-fill task, so each time I have to reach to the extension button on the browser bar to pull out the password and go back to the form to manually paste it.