append-to-clipboard

A webextensions (Firefox or Chrome) add-on to allow appending to the clipboard, optionally with a single or double line break in between as well as a "clear clipboard" option.

You may find Copy Plain Text or Copy Plain Text WE helpful if you wish to ensure your first copy is as plain text.

Todos

1. Add option to retrieve selection for appending as text or HTML
   or HTMl source (regardless of original source)
2. Any way with webextensions to support additional copy flavors? Could
   support appending multiple images
3. Once Firefox supports, use smoother
   clipboard API,
   and, if their webextensions implementation starts to allow for using the
   clipboard in background scripts, do so.
4. Allow appending of link location or text (as per
   this comment of issue #1)
5. Allow definition and use of multiple user-defined separators (in context
   submenu) (as per issue #1)
6. Allow for appending into (and pasting from) numbered buffers
7. Key commands
   for each command slot as in:
   https://addons.mozilla.org/en-US/firefox/addon/addmoretexttoclipboard/;
   allow each to be customizable using https://github.com/brettz9/key-selector?
8. Find way for "Clear clipboard" to work, or at least not show up, on
   empty tabs (setting <all_urls permission didn't work)