The dial-page context menus invoked window.dial.* functions via
browser.tabs.executeScript. That API is deprecated since Firefox 149 and
removed in Firefox 152, which broke creating/editing bookmarks and folders
from the dial page (issue #192).
Switch the menu handlers to browser.tabs.sendMessage. New menu command IDs
(200-207) are added to the Commands enum in both background.js and dial.js,
and the existing runtime.onMessage listener in dial.js now dispatches these
commands to the corresponding dial.* functions using the page-side
_selectedItem state.
Fixes#192
Robert Manner