I install ubuntu 26.04 LTS and tested it.

it works.

thank you.

I don't know what is your environment, what is happened, and any information.
I can't help you like those question. Plus, this is open-source code. So if you want, Ask with AI. that is the fast way I think.

First, check if it's the latest version,
This add-on does not work in the list of posts, but only when you right-click on a blank space inside the post.
I work without any problems, so maybe there's nothing wrong with the add-on itself.