quicksave.io by Aleksander Gajewski

This add-on is EXPERIMENTAL.

This add-on is NOT STANDALONE.
It does not provide private persistence data storage.
It requires a running server to be fully functional.

It provides:
- a toolbar button,
and
- a context menu for 'page', 'link', 'selection', 'image', 'audio' and 'video'.
Based on URL or plain-text selection, it triggers a create request on a server.

To run local server check:
https://dev.quicksave.io

The add-on source is available on:
https://github.com/adiog/io_quicksave_firefox