I just installed waterfox and the xpi files and the button is there.
I had to go into manage extensions and turn permissions on to get these extensions to work.
TreeView shortcut = Ctrl-Alt-T. It’s under the heading “Using the Tree View”
Poster report shortcut = Ctrl-Alt-R.
I wasn’t able to get either keyboard shortcuts to work in mozzilla or chrome.
Poster Report returns the same permissions error as firefox and doesn’t display the report.
The buttons suddenly showed up but same as you, Poster Report doesn’t work. Not worried about it. Ctrl+Alt+T opens my terminal in Kubuntu LOL
Tree View works with the new button though.