I got the same screen. downloaded firefox 51/52 esr, says not supported. My cameras are 933 and looks like won't be able to use them on the computer anymore.
It can be done! Using IE11 on Windows 10 as we speak. It is a convoluted method, but it still works as of this morning.
Here is what I had to do.
1. Logged into my router to find my camera's IP address. You must be hard-wired with ethernet to do this.
2. Using the IP address I found I used IE11 and input that IP address as a URL: (for example only: https://192.168.1.17 )
3. This will bring up the Camera's config log-in. My cameras are DCS-2630L.
4. You will see a warning screen as follows, with only 2 options:
This site is not secure
This might mean that someone’s trying to fool you or steal any info you send to the server. You should close this site immediately.
Option 1: Close this tab
Option 2: More information
5. Choose option 2 and you will get another warning of sorts and only one option:
Your PC doesn’t trust this website’s security certificate.
The hostname in the website’s security certificate differs from the website you are trying to visit.
Error Code: DLG_FLAGS_INVALID_CA
DLG_FLAGS_SEC_CERT_CN_INVALID
Go on to the webpage (not recommended)
6. Follow the link to the not recommended option.
7. This will bring up the camera's admin log-in page just as if you hit the old link to "advanced settings" in MYDlink.com. There is also a Live View.
8. I may have used some other security settings in IE11 to allow this. I will check back here periodically to see if other users can use this method. If you
cannot, I may delve deeper into my IE11 security settings to try to help you.
My Rig:
Custom desktop.
Ethernet connection to router.
Edition Windows 10 Pro
Version 21H2
Installed on 12/19/2019
OS build 19044.1826
Experience Windows Feature Experience Pack 120.2212.3920.0
IE11 -- the only times I use IE11 is for the cameras!
