The extension doesn't work on Firefox 112.0.2, Windows 10

[me21]

The status is displayed as "[Disabled] to enable, use the popup window".
I right click on the extension button, it's shown to be in black-list mode.
I left click on the extension button and go into settings - the black list is empty. It should be enabled on all pages, right?
I left click on the extension button again and choose any user agent - it's not applied, the extension icon is still gray.

[me21]

Found it, had to click on "Apply (container)" button. For some reason, I had the impression that the user agent will be updated immediately when I selected one of them.