Is there a way to see all friends who have currently deactivated accounts?
Yes you can , now Facebook itself shows the list of all the friend including deactivated account . For view this you need to just check your friend list , you will find all the deactivated friend with no profile pic .
Go profile and then friends and at the search just Type some random letter like ja, ta, be, ma, ka, jo which according to you make be the starting two letters of a person name, Then check the result. Look for the profile without picture, ctrl/cmd click on that profile name and message box will appear if that particular profile is deactivated then click unfriend.
Till date this is the only solution.
There is a safe and free browser extension available for Chrome, Firefox, Safari, Edge and Opera called FB Purity that adds functionality to easily see the full list of all your friends with deactivated facebook accounts.
If you click that link, it will search through your full list of friends and show only the deactivated accounts.
I've found this firefox extention while surfing for same question around : https://www.fbpurity.com/user-guide.htm
Once installed go to your friend list and it will show another link to "deactivated accounts"
Hope that helps.