When I opened some old Dahua NVR and IP cameras in the browser, I got a pop-up message: Please download the chrome app or Please install plugins first.
But you won’t be able to install it because the NPAPI (WebComponents) plugin is no longer supported by new browsers.
On older Windows, using Internet Explorer helped, but on Windows 11 it is not available, so I used Microsoft Edge.
In Edge, open “Settings” – “Default browser” and select “Allow” opposite “Allow sites to reload in Internet Explorer mode (IE mode)”, restart the browser to apply the changes.
In the future, when opening the Dahua device page, in the Edge menu (…) select “Restart in Internet Explorer mode”. This option helped me and there is no need to install the plugin.
You can also update the firmware to support HTML5, if it exists, or you can use SmartPSS, this software allows you to edit some settings.
See my other articles about Dahua