Cannot Add Firefox Add-ons to Toolbar or Overflow

Hello.
First, I tried to search about it, couldn't find an asnwer.
I use Firefox and Firefox Developer and issue is the same on both browsers.

I have add-ons, in my add-ons list, which are activated,but they are not either in the toolbar or the overflow menu or even in the drag and drop section of customize toolbar menu.

Does Firefox have an add to toolbar function somewhere or once an item is removed from toolbar, it cannot be added to toolbar ever again in the year 2021?

I guess, you can recreate the issue, by adding n add-on, removing from toolbar, where you don't see it even in the drag section of the customize toolbar section and try to add it to toolbar again.

Thanks.

IMayNeed, yes, me too hello and welcome to TF ,
v85.0.2 works fine here. When did this problem start and what version are you using?

Try creating a new profile for testing and see if the same happens there.

Same version.
I cannot try adding in any profile, because I cannot see an 'add to toolbar' or 'add to overflow' menu anywhere.
Once it is removed from all 3 locations shown in the image, it cannot be added again.
Try removing an add-on from toolbar, overflow, and the customize menu.
It cannot be added again.
Try recreating the problem, and see.

P.S.: I accept the possibility that I am missing something. And I did try the new profile.

Create a new Firefox profile: Profile Manager - Create, remove, or switch Firefox profiles | Firefox Help you can do it

How are removing the add-ons when this happens?

You can all just uninstall Firefox and reinstall it without losing your profiles, but back them up anyway. I've had to do this before to solve some weird FF problems before after trying many other things first.

Right click on the tool bar, customize, drag missing/removed shortcut back to toolbar - just did it.

Because you didn't remove the item from the blue area in the picture.
If you remove it from there, you cannot add it again.

I don't understand you picture ...... no icons shown. Show me a real picture with add-on icons on it.