@erikreegisteel: Sorry, I only just realised the popup doesn't show up on Opera in its full width, and that's what's wrong. For what it's worth, an update to fix this issue is already in the publishing queue (since August, 2024), we will now have to wait for a moderator to verify the changes. Then you should be able to have the on/off switch on all pages.

The addon moderation process takes a while on Opera, I will reply to your comment again once the update got released.

@erikreegisteel It should already be possible to toggle the plugin off and on for certain websites. You can click the extension icon while visiting Reddit, for example, to display a on/off switch, asking if you'd like "Communize www.reddit.com?". You can also see this little popup in the screenshot, but it's possible that something broke since that screenshot was taken.