slows down firefox: CopyTables is attempting to register its context menu entries (menus.create) on the window creation hook without clearing existing menu IDs or checking if they exist. When you open a new window, its background script crashes on unhandled API rejections across 16+ menu items, blocking the browser's UI thread from finishing the window creation promise chain.

Select a table on a website. In the context-menu, everything is greyed out.
Even when I manage (by accident) to get the context menu not greyed out, "copy" (no matter what) does not copy anything to the clipboard.

Totally useless

Many times select column is greyed out! (only next/prev table is clickable)

Selects rows and columns as expected, but copies only the whole table and only as text (default Firefox behavior). Unfortunately, useless.

Linux Mint 21.3
Firefox 137.0