Strange "Unknown Collection" messages in the console after startup
I'm using Firefox ESR 78.15 with a slightly modified Arkenfox user.js
I keep getting two "Unknown Collection" messages in the console after startup.
The first one reads Unknown Collection "main/messaging-experiments" in the headline, while the following text is shown in the drop down menu: "UnknownCollectionError resource://services-settings/RemoteSettingsClient.jsm:155 sync resource://services-settings/RemoteSettingsClient.jsm:455 InterpretGeneratorResume self-hosted:1158 AsyncFunctionNext self-hosted:693
The second one reads "Unknown Collection "main/cfr-fxa" in the headline, with the same text in the drop down menu as above.
Can someone please explain what these messages mean and if it is something to be concerned about?
I've spent quite some time, but couldn't find out.