Clipper on windows firefox cannot clip support.mozilla.org pages

Trying to clip this page and ran into a problem that sounds like this .

I can clip other pages in general, but I cannot clip any pages from https://support.mozilla.org . When I try, I get the message:

The Joplin extension is not available on this tab due to: Missing host permission for the tab

Is this something in the clipper configuration?

I've tried clipping in private window, re-installed the add-on with a browser restart, but it did not help.

I'm using clipper version 1.6.1 on Firefox 88.0.1 on windows 10. I don't think it's reached the desktop client at this point, but the info is below.

Joplin 1.7.11 (prod, win32)

Client ID: 91365061178a49ae9979526f6e992f33
Sync Version: 2
Profile Version: 34
Keychain Supported: Yes

Revision: f560563d8 (master)

In about:config, the value of extensions.webextensions.restrictedDomains contains a list of values which no addon can interact with. You'd have to remove it explicitly.

It's done for security reasons as far as I can remember, though I can't remember what specifically they are. (I think there's a chance Firefox might let Firefox related websites access functionality that normal sites and thus extensions can't, and also to prevent extensions trying to hide their own remove buttons for example).

That was it. I tested by by removing the support.mozilla item in the about:config entry, reloaded the page, and the clipper worked.

Thanks for the pointer,